Cnidarians uses arm-like parts called tentacles to sting.
Explanation:
Animals belonging to genus Cnidaria use arm-like structures called tentacles to sting. The cnidarians tentacles are present with specialized stinging cells called cnidocytes.
These cnidocytes are responsible for the stinging action which is done by the cnidocyte organelle called the nematocysts or the stingers.
Nemotocyts contain coiled thread or barb-like or hair-like structures which fires the toxin out while stinging.
The opening or the mouth-like parts on the tentacles contain numerous cnidocytes which releases toxin when the tentacles are touched by another organism or when the cnindarian touches its prey.
What are the four main components of Darwin’s theory of evolution?
Answer:
There are four principles at work in evolution—variation, inheritance, selection and time. These are considered the components of the evolutionary mechanism of natural selection.
Explanation:
Answer:
Sample Response: Darwin concluded that organisms become different over time and that all organisms have common ancestors. He also stated that the evolution of a population occurs slowly over an extended period of time and that natural selection is the process that drives evolution.
Explanation:
Question 3 of 10
2 Points
What term is used to describe how well an organism functions in its
environment?
O
A. Evolution
O
B. Selection
O
C. Fitness
O
D. Variation
SUBMIT
Answer:
The answer is C. Fitness
Which of these is a benefit of fish farming?
Answer:
c) It provides an alternate source of seafood
Explanation:
Options:
A) It depletes native fish populations
B) It poses a risk of disease for wild stocks
C) It provides an alternate source of seafood
D) It pollutes natural bodies of water
Fish farming is a method in which a specialist, usually a biologist, breeds freshwater or marine fish species in large quantities (in-vitro) in big tanks with the aim of selling these fish for food. In many cases, biologists manipulate these fish to get bigger and healthier fish, which in turn will produce more economical gain.
The main advantage of this method is that it provides an alternative source of seafood as, due to overexploitation, conservationists have detected a significant decline on fish populations in the ocean and in freshwater ecosystems.
If it takes 5 seconds for you to do 1000J of work, what is your power output?
Answer: 200 watts
Explanation:
Power is simply the ability to do work. In essence, power is workdone per unit time.
So, Power = Workdone / time taken
In this case, time taken = 5 seconds
Workdone = 1000Joules
Power output = 1000 joules ➗ 5 second
= 200 watts (power is measured in watts)
Thus, your power output is 200 watts
Which statement describes the tropical climate zone?
It extends towards the south of the equator only.
It extends towards the north of the equator only.
It extends only a few miles on both sides of the equator.
It extends about 1600 miles on both sides of the equator.
Answer:
The correct option is D) It extends about 1600 miles on both sides of the equator.
Explanation:
A tropical climate can be described as regions of the Earth where the mean temperature remains greater that 18 degrees Celsius during all the twelve months of the year.
A tropical climate is also known as 'equatorial', because places found on or close to the Equator are typically tropical: they're warm and wet. The tropical zone includes the Amazon Basin of Brazil, West Africa's Congo Basin and the rainforests of Malaysia and Indonesia.
Answer:
d
Explanation:
in which phase of meiosis does the chromosome number change from diploid to haploid
The chromosomes number changes from diploid to haploid during anaphase I of Meiosis I. Subsequently, Meiosis II separates sister chromatids to result in four unique haploid cells.
Explanation:Change from Diploid to Haploid in MeiosisThe change from diploid to haploid chromosome numbers during meiosis occurs after Meiosis I. Specifically, it is during anaphase I of Meiosis I that homologous chromosomes are separated and pulled to opposite poles of the cell. This reductional division halves the chromosome number from 2n to n, thus from diploid to haploid, setting the stage for the formation of haploid gametes after Meiosis II.
During Meiosis II, the sister chromatids within the two daughter cells formed in Meiosis I separate, yielding four unique haploid cells. This second division is akin to mitosis but occurs with half the number of chromosomes. Therefore, it is in Meiosis I that the reduction from diploid to haploid truly occurs, solidified by the subsequent processes in Meiosis II. Each resultant cell has a haploid number of chromosomes, carrying genetic information from both parents, due to the assortment of chromosomes and crossing over events that occurred.
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Anaphase I of meiosis is when the chromosome number changes from diploid to haploid.
During anaphase I of meiosis, homologous chromosomes separate and move to opposite poles of the cell. This results in the reduction of chromosome number from diploid (2n) to haploid (n) in each daughter cell, as each cell receives only one set of chromosomes instead of the homologous pairs.
71 POINTS HELP!!!!!!!!!
A magnet can hold a piece of paper to the door of a refrigerator. How does the magnet stick without touching the door?
Group of answer choices
The magnetic force of the magnet can act at a distance.
The magnet induces a magnetic field in the paper.
Gravity attracts the magnet to the door.
Atoms from the magnet pass through the paper and touch the door.
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Question 5 8.33 pts
Giovanni sprinkled iron filings around a magnet. Which of the following did Giovanni most likely see?
Group of answer choices
The iron filings randomly falling around the magnet
The iron filings spread evenly around the magnet.
The iron filings lining up with the magnetic field lines
The iron filings accumulating only at the poles of the magnet
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Question 8 8.33 pts
If you increase the distance between two magnets, what will happen?
Group of answer choices
The magnetic attraction will decrease.
The magnetic attraction will strengthen.
The magnetic attraction will stay the same.
The magnetic attraction will increase.
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Question 10 8.34 pts
Another student made an electromagnet with an iron nail with eight coils of wire wound around it connected to a 2-V battery. She wants to increase the strength of the electromagnet. What changes can she make to her design to increase its strength? Select all that apply.
Group of answer choices
wrap more coils of wire around the nail
use two 1-V batteries instead of a 2-V battery
use a longer wire
use a 4-V battery
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Question 11 8.34 pts
Jazelle has five different-sized magnets. She puts each magnet far away from a paper clip and slowly moves it closer until it attracts the paper clip. She records the distance between the magnet and the paper clip when it attracts. What is Jazelle's experiment designed to test?
Group of answer choices
how the type of paper clip affects the way in which it reacts to the force of a magnet
how the magnetic force of a magnet affects the movement of an object
how the size of a paperclip affects the strength of its magnetic pull on objects
how the size of a magnet affects the strength of its magnetic pull on objects
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Question 12 8.34 pts
Kayla has two magnets. She would like to know how much magnetic energy is stored in each one. What would be the best way for her to determine which magnet has the most magnetic energy?
Group of answer choices
Attach wires to the ends of each magnet and measure the currents going through the wires
Measure how close each magnet can get to a metal object before picking it up.
Record the mass of each magnet by measuring it on a balance scale.
Put each magnet into a beaker of water to see how much water it displaces
Answer:
1st Qn) 1st option, the magnetic force of a magnet can act at a distance.
magnetism cannot be induced on the paper since paper is a non-magnetic material. In fact, the magnetic field can pass through the paper.
Gravity cannot attract the magnet to the door. Gravity only pulls things down towards the earth.
Magnetism does not involve the movement of atoms.
Q5) 3rd option, the iron filings lining up with the magnetic field lines
I've attached the diagram of how the iron filings look.
Note that although the filings are mostly concentrated at the poles of the magnets, they do not only accumulate there. Most of them are there as magnetic fields are stronger near the poles of the magnet.
Q8) 1st option, the magnetic attraction will decrease.
Q8) 1st option, the magnetic attraction will decrease.Q10) 1st option, wrap more coils around the nail.
Q8) 1st option, the magnetic attraction will decrease.Q10) 1st option, wrap more coils around the nail.Q11) 4th option, how the size of the magnet affects the strength of its magnetic pull on objects.
He used the same paper clip so he cannot be testing how the type of paper clip affects the way in which it reacts to the force of a magnet. For the same reason, option 3 I wrong too.
Q12) 2nd option, measure how close each magnet can get to a metal object before picking it up.
The mass of a magnet does not show its magnetic field strength.
4th option is simply measuring the volume of the magnets.
Answer:
Answer:
1st Qn) 1st option, the magnetic force of a magnet can act at a distance.
magnetism cannot be induced on the paper since paper is a non-magnetic material. In fact, the magnetic field can pass through the paper.
Gravity cannot attract the magnet to the door. Gravity only pulls things down towards the earth.
Magnetism does not involve the movement of atoms.
Q5) 3rd option, the iron filings lining up with the magnetic field lines
I've attached the diagram of how the iron filings look.
Note that although the filings are mostly concentrated at the poles of the magnets, they do not only accumulate there. Most of them are there as magnetic fields are stronger near the poles of the magnet.
Q8) 1st option, the magnetic attraction will decrease.
Q8) 1st option, the magnetic attraction will decrease.Q10) 1st option, wrap more coils around the nail.
Q8) 1st option, the magnetic attraction will decrease.Q10) 1st option, wrap more coils around the nail.Q11) 4th option, how the size of the magnet affects the strength of its magnetic pull on objects.
He used the same paper clip so he cannot be testing how the type of paper clip affects the way in which it reacts to the force of a magnet. For the same reason, option 3 I wrong too.
Q12) 2nd option, measure how close each magnet can get to a metal object before picking it up.
The mass of a magnet does not show its magnetic field strength.
4th option is simply measuring the volume of the magnets.
Explanation:
What is the continental drift theory and who proposed iy
Answer:
Explanation:
Alfred Wegener first proposed the theory of continental drift.
Which materials are excreted through sweat glands in the skin?
Answer:
Sweat glands remove waste by secreting water, nitrogenous waste, and sodium salts. Sweat glands also regulate temperature.
Which of the following is considered to be the broadest taxonomic division?
A.
Phylum
B.
Domain
C.
Kingdom
D.
Family
Answer:
B. Domain
Explanation:
The broadest group is Domain which consists of Eukarya which includes the organisms that most people are most familiar with-all animals, plants, fungi, and protists
Answer:
The Answer: Domain
Explanation:
what collison turned earth into a molten ball of fiery lava
Answer:
can you explain more please. I think you are talking about the Big Bang Theory but i don't understand you question.
Explanation:
Betta splendens is a common pet. In the wild, most males are red and most females are brown. However, breeders have bettas in a variety of sizes, shapes, and colors, as shown below.
Which term best describes the development of the bettas sold in pet stores?
A:artificial selection
B:natural selection
C:acquired trait
D:population genetics
The term that described the development of the bettas sold in pet stores should be artificial selection.
What is artificial selection?It refers to the selection where the human identification should be done that represents the traits in the plant & animals. Also, the steps should be taken for enhancing the traits in the future generations.
Since betta splendens should be the common pet. So here the artificial selection should represent the creation of the bettas that need to be sold in the pet stores.
Therefore, the option A is correct.
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8. Which of these is a behavioral adaptation?
A) A hognose snake pretends it is dead to trick
a predator. B) A frog's light-colored belly makes it harder
for a predatory fish to see it against sunlight
on the water surface.
C)The scarlet king snake looks very much like
the poisonous coral snake. D) A treehopper on a leaf or twig resembles
a thorn.
Answer:
A) A hognose snake pretends it is dead to trick a predator.
Explanation:There is behavioral adaption and structural adaption. Behavioral adaption are actions animals take in order to survive their environments such as hibernation or migration. Structural adaption is a characteristic in a plant or animal's body that helps it to survive its environment such as camouflage. Answers B, C, and D are all examples of structural adaption.
A) the hognose snake one
What is microevolution?
changes in a population's allele frequencies
major changes in populations over a long time
genetic changes among and within populations
evolution of new species
Answer:
genetic changes among and within populations
Explanation:
Microevolution occurs when there are changes in gene frequency within a population over a short period of time. Microevolution specifically refers to changes within a population, a population being a group of organisms that breed with each other.
hope this helps :)
Describe photosynthesis using words that a 5-year-old could understand.
Answer:
Explanation:
Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis is necessary for life on Earth. Without it there would be no green plants, and without green plants there would be no animals.
Photosynthesis requires sunlight, chlorophyll, water, and carbon dioxide gas. Chlorophyll is a substance in all green plants, especially in the leaves. Plants take in water from the soil and carbon dioxide from the air.
How do some of non-resistant bacteria become antibiotic-resistant
When an antibiotic is given for a non- resistant bacteria it inactivates or kills the bacteria however some microbes do not die and survive and multiply and pass the infection to other people making the bacteria antibiotic resistant.
Explanation:
The antibiotic resistant bacteria are those that are able to resist the effect of antibiotic and renders them ineffective that was once able to kill or inactivate bacteria.
While antibiotic non-resistant bacteria are those that are not able to resist the effect of antibody.
The reason some non-resistant bacteria becomes resistant is that a mutation in the nonresistant bacteria may occur or continuous exposure of the antibiotic would make it resistant to it.
Every time an antibiotic is taken for some bacterial infection it kills the bacteria but some that survive become resistant and grow in numbers and get transfer to other people causing them to be antibiotic resistance. The infection transfer to other people would not be treated by once used antibiotic as the microbe has become resistant.
During the cell replication due to some mutation caused they get resistant to antibiotic by a process called selective pressure.
Given the mRNA codons AGC UUC GAU, what would be the resulting amino acid sequence after translation?
a. Aspartic acid-Phenylalanine-Serine
b. Serine-Phenylalanine-Aspartic acid
c. None of the above
d. Methionine-Asparagine-Leucine
e. Serine-Lysine-Leucine
Answer:
Option B) Serine-Phenylalanine-Aspartic acid
Explanation:
mRNA codons AGC code for the amino acid, serine while UUC code for phenylanine and GAU code for aspartic acid.
Thus, the resulting amino acid sequence after translation will be a tripeptide containing Serine-Phenylalanine-Aspartic acid
Answer:
b. Serine-Phenylalanine-Aspartic acid
Explanation:
Gene expression, which is the process of using the information present in a gene to synthesize protein, involves two major stages: transcription and translation. Transcription involves the synthesis of a mRNA molecule using a DNA template. It is the process of copying the information in a DNA into a complementary mRNA molecule.
Once the mRNA has been synthesized, it proceeds for translation in the ribosome (organnelle for protein synthesis). However, in the ribosome, the nuceleotide sequence of the mRNA is read three at a time. This group of three nucleotide sequence is called CODON. The set of all codons make up the GENETIC CODE. Each coding specifies a particular amino acid i.e. reading a codon means addition of a particular amino acid to the polypeptide chain.
This question contains a mRNA with nuceleotide sequence: AGC UUC GAU, which consists of three codons. Hence, three amino acids will be produced.
In the genetic code provided as an attachment to this question, we can obtain which CODON specifies which AMINO ACID.
AGC codes for Serine
UUC codes for Phenylalanine
GAU codes for Aspartic acid
Hence, mRNA sequence, AGC UUC GAU will produce an amino acid sequence Serine-Phenylalanine-Aspartic acid.
What is in a bacterial cell
Answer:
It contains enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids.
Explanation:
Answer:
IT is
Explanation:
It is a gel-like matrix composed of water, enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids. The cell envelope encases the cytoplasm and all its components. Unlike the eukaryotic (true) cells, bacteria do not have a membrane enclosed nucleus.
How would you account for the fact that fossils of fish are not present in the older layers of rock?
Answer:
The fish did not yet exist when the old layers of rocks were deposited. In fact, animals with hard parts did not evolve until about 600 million years ago, which is only about 13% of the 4.5 billion year age of the Earth. Multicellular animals without hard parts left tracks in older sediments, but had no fossilize-able body parts.
Explanation:
A population of black bears depends on salmon from a stream for food. If a drought causes the stream to run dry one year, how will this likely impact the black bear population? A. The population's size will increase. B. The population will thrive on new species of fish. C. The population will be unaffected. D. The population's size will decrease.
True or False The color-coded world map is used to explain the age of the Atlantic ocean floor( crust )
The given statement is true.
Explanation:
Crust refers to the top most upper layer of the earth's surface. Crust consists of two parts: SIAL and SIMA. Sial comprises Silicon and Auminium whereas Sima comprises Silicon and Magnesium. Sima is heavy in weight and sial is lighter in weight. Sima floats on Sial. Crust is of two types: Continental and Oceanic crust.
Atlantic ocean is the second largest ocean in the world. The age of the sea floor which is made up of materials erupted from volcanic explosion. Mid oceanic ridge formed due to volcanism and create a thick bed in the sea floor. By using color coded map deep to light shaded age of the ocean floor can be determined.
The color-coded world map is not specifically used to explain the age of the Atlantic ocean floor (crust), but it can provide a visual representation of the distribution of land and oceanic areas. The Atlantic Ocean is formed through plate tectonics, where the oceanic crust is moving apart along the mid-Atlantic ridge, creating new and relatively young oceanic crust.
Explanation:The color-coded world map is not specifically used to explain the age of the Atlantic ocean floor (crust). Instead, the age of the oceanic crust is determined through other geological methods. However, the map mentioned in the question, which shows Earth's crust and ocean floor, can provide a visual representation of the distribution of land and oceanic areas.
The Atlantic Ocean is one of the major ocean basins on our planet. It is formed through plate tectonics, where the oceanic crust is moving apart along the mid-Atlantic ridge. This process creates new oceanic crust, which is relatively young compared to the age of the Earth.
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Before cells divide their DNA replicates to form two identical copies. Is it always a good thing for the
DNA to be copied accurately? Why or why not?
Answer:
we often yhink of mutations as a negative thing, but that isn't always the case. these errors, or changes in DNA, are essential to evolution. usually they're neither good or bad, just different. alleles are what make us unique such as our hair color, skin color, height, etc
Explanation:
Ben made the following bar graph shown to represent the relative distances of four different astronomical bodies from Earth.
The title of the bar graph is Distance of Bodies in Space from Earth. Four bars are labeled A, B, C, and D. Bar C is the shortest. Bar D is about three times the size of bar C. Bar A is about six times the size of bar C. Bar B is about eight times the size of bar C.
If A represents the sun, which of the following could be represented by C and D?
C could be Venus, and D could be the moon.
C could be Uranus, and D could be the moon.
C could be the moon, and D could be Venus.
C could be Uranus, and D could be Venus.
Answer:
C could be the moon, and D could be Venus.
Explanation:
Now let's take in consideration that the bar graph represents the distances of the different astronomical bodies relative to the Earth.
You have the following astronomical bodies:
Sun
Moon
Venus
Uranus
Now think about the actual distances of these bodies from Earth.
Among all, the moon is the closest, so this means that the shortest bar would be the moon.
Moon is C.
Again, let's see what else is given. It says that A is the sun, so it is about six times the size of bar C, while Bar D is three times the size of bar C. This makes Bar D the second shortes bar. So among the bodies given, Venus is the next closest. This means that Bar D is venus.
Explanation:
c could be the moon and d could be Venus
super sigma
Why do frogs croak, what makes them croak, and is it used for mating?
Answer:
they croak to show agresion
Explanation:
b/c they use it to pretect females
1. The male frogs croak to attract female frogs so that they can mate.
2. Frogs croak by moving air over their vocal cords and causing them to vibrate.
3. Definetly
A gene has the base sequence TAC CG. Give an example of a point mutation on this gene.
Answer: An example of point mutation on the gene is TGC CG.
Explanation: Mutation is a permanent alteration in the nucleotide sequence of a DNA. Point mutation is a type of mutation in which there is a change in only one nucleotide molecule in a DNA sequence. A point mutation can occur at any point in the nucleotide sequence of a DNA and can be as a result of replacement of one nucleotide molecule by another. For example, in the the sequence TAC CG, any of the nucleotides can be replaced by another nucleotide such as in TGC CG, Adenine is replaced by Guanine.
what kind of cells have chloroplasts?
Answer:
Plant cells
Explanation:
Answer:
plant cells
Explanation:
chloroplasts use the energy form the sun and oxygen and CO2 and other materials to make glucose (sugar) to feed themselves. this is impossible without the chloroplasts. Animals do not have chloroplasts because they go around eating other plants which already have the sugar in them.
During ___ the cell uses information from messenger RNA to produce proteins
Answer: Translation
Explanation: Translation is a process in which the genetic information encoded in an mRNA molecule is used to make proteins. Translation occurs in the ribosome. The mRNA contains codons which codes for particular amino acids. These codons are read by the ribosome one at a time while the transfer RNA fetches the corresponding amino acid and attaches it to the growing polypeptide chain. Amino acids are monomeric units of proteins. The amino acids sequence produced undergoes some modifications and packaging to form protein.
Final answer:
During translation, the cell uses mRNA to produce proteins. mRNA carries instructions for protein synthesis from the DNA to the ribosomes. Ribosomes read the mRNA in sets of three bases called codons.
Explanation:
During translation, the cell uses information from messenger RNA (mRNA) to produce proteins. mRNA carries the instructions for protein synthesis from the DNA in the cell nucleus to the ribosomes in the cytoplasm. With the help of ribosomes and transfer RNA (tRNA), the mRNA is read in sets of three bases called codons, and each codon codes for a specific amino acid. This process ensures that proteins are made when needed in the cell.
4. Propose a design for another experiment that tests moth phenotypes in
a forest where there are no predators. The limiting factor is food availability
for caterpillars (baby moths) and caterpillars with larger mouthparts are
able to obtain food faster. What data would researchers need to collect in
this experiment to show how natural selection affects the moth populations?
Answer:
To test the phenotypes of the moths , we will design an experiment in which we will count the number of caterpillars at the time of birth along with the baby moth which have large mouth parts and those which do not have large mouth parts.
After time, t, when the moths grow we will again count the number of large mouth moths and the number moth which had a small mouth to check which of them were better adapted to survive in the environment where food was the limiting factor.
Final answer:
To test how natural selection affects moth populations with caterpillars of different mouthpart sizes in food-limited environments, researchers would measure mouthpart size, food consumption rates, and reproductive success, expecting directional selection to favor larger mouthparts.
Explanation:
To test how natural selection affects moth populations in a forest where predators are absent but where the limiting factor is food availability for caterpillars, researchers could design an experiment where caterpillars with varying mouthpart sizes are observed.
First, researchers would measure and record the mouthpart size of each caterpillar in the population. Then, they would monitor the rate at which caterpillars with different mouthpart sizes consume food. The availability of food would be controlled to simulate scarcity, thereby exerting a selection pressure on the caterpillars.
The main data collected would include the mouthpart size of the caterpillars, the speed and efficiency of food consumption, survival rates, growth rates to adulthood, and the reproductive success of moths with different sizes of mouthparts. As caterpillars with larger mouthparts should be able to obtain food faster and thus have a selection advantage, researchers would expect to see an increase in the frequency of this phenotype in subsequent generations.
Over time, if caterpillars with larger mouthparts survive and reproduce more successfully, it would be evidence of directional selection favoring a certain phenotype due to the environmental pressure of limited food availability.
Which of the following small objects revolve around the Sun?
A. meteoroids
OB. comets
C.
asteroids
OD. all of these
Answer:
OD. all of the above
Explanation:
Asteroids are lumps of rock or iron that orbit the sun.
Comets go around the Sun in a highly elliptical orbit. They can spend hundreds and thousands of years out in the depths of the solar system before they return to Sun at their perihelion.
Asteroids orbit the Sun in a region between Mars and Jupiter. This "belt" of asteroids.
Samuel ate some vegetable soup. What process is at work to allow Samuel to break down the soup so that his body will be
able to produce energy?
growth
absorption
excretion
digestion
Samuel ate some vegetable soup. Digestion process is at work to allow Samuel to break down the soup so that his body will be able to produce energy.
Option: D
Explanation:
There are majorly four steps in food processing in human body, these are ingestion, digestion, absorption and elimination. There are six major phases covered by digestion: ingestion, acceleration, mechanical or physical digestion, chemical digestion, absorption and defecation. The first of these procedures, ingestion, relates to the absorption of food via the mouth into the food canal.
Digestive system allow the transformation of massive insoluble food molecules into small water-soluble food components to dissolve them into the watery plasma of the blood. Many smaller particles are ingested into the bloodstream in certain species through the small intestine.