Answer:
I’m pretty sure the answer is covalent
Hope this helps have a good day :) please mark me the brainliest?
Answer: Option (a) is the correct answer.
Explanation:
Atomic number of carbon is 6 and its electronic distribution is 2, 4. Hence, to complete its octet it needs to acquire 4 more electrons from another atom.
Whereas atomic number of hydrogen is 1 and in order to complete its octet it needs to gain one more electron.
So, when a carbon atom comes in contact with 4 hydrogen atoms there there occurs sharing of valence electrons by each atom.
As it is known that a bond formed by sharing of electrons is known as a covalent bond.
Thus, we can conclude that in [tex]C + 4H \rightarrow CH_{4}[/tex] the bond formed between the elements is covalent bond.
What statement is true about the functions? Structure 1 is the stamen and Structure 2 is the pistil. Structure 1 is the stem and Structure is the waxy covering. Structure 1 is the pistil and Structure 2 is the fuzzy hair. Structure 1 is the waxy covering and Structure 2 is the stamen.
Answer:
Structure 1 is the stamen and structure is the pistil
Explanation:
Final answer:
The statement that is true about the functions is 'Structure 1 is the stamen and Structure 2 is the pistil.' These structures are central to the reproductive processes of a flower, with the stamen producing pollen and the pistil consisting of the stigma, style, and ovary.
Explanation:
The stamen and the pistil are key parts of a flower's reproductive system. The stamen, which is the male reproductive part, includes the filament and the anther where pollen is produced. The pistil, or gynoecium, is the female reproductive part of the flower, consisting of the stigma, style, and ovary. The stigma serves as the site for pollen deposition and is often sticky to capture pollen effectively. The style is a slender column that connects the stigma and the ovary, enabling the pollen tube to reach the ovary where fertilization takes place. Inside the ovary, ovules develop, which eventually become seeds after fertilization.
If a person's heart is pumping 5000 ml of blood in one minute and the heart rate is 50 beats per minute, what is the cardiac output?
Answer:
5,000 mL/min
The cardiac output is 250,000 ml/minute when the heart is pumping 5000 ml of blood in one minute and has a heart rate of 50 beats per minute.
Explanation:The cardiac output is the volume of blood pumped by the heart in one minute. It is calculated by multiplying the heart rate (number of beats per minute) by the stroke volume (volume of blood pumped per beat).
In this case, the heart is pumping 5000 ml of blood in one minute and the heart rate is 50 beats per minute.
Therefore, the cardiac output is calculated as:
Cardiac Output = Heart Rate x Stroke Volume
Cardiac Output = 50 beats/minute x 5000 ml/minute = 250,000 ml/minute
So, the cardiac output is 250,000 ml/minute.
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Which of the following is found inside a pollen grain?the female gametophyte,the male gametophyte,the megaspore,the sporophyte
Answer:
the male gametophyte
Explanation:
Pollen grains are structures in the seed plants (spermatophytes) which contain vegetative cells but also reproductive cells - microgametophytes. Microgametophytes produce 2 male gametes or sperm cells. Vegetative cells produce pollen tube which is involved in the transfer of sperm cells to the ovule (female structure that forms female gametes). Pollen grains are different in shape, size and color, but all of them are enveloped with hard coat that has protective role.
What substance found in turkey is known for making you sleepy?
amino acid tryptophan
Contrary to popular belief, eating turkey isn't the main reason you feel sleepy after a Thanksgiving feast. The oft-repeated turkey myth stems from the fact that turkey contains the amino acid tryptophan, which forms the basis of brain chemicals that make people tired
20pts.
Match these items.
1 pharynx
windpipe
2vein
branch from trachea
3artery
voice box
4 pulmonary
back of throat
5larynx
passageway for food
6esophagus
lower chest muscle
7bronchus
lungs
8trachea
transport of oxygenated blood
9diaphragm
transport of carbon dioxide in blood
Answer:
1-pharynx-back of throat
2-vein-transport of carbon dioxide in blood
3-artery-transport of oxygenated blood
4-pulmonary-lungs
5-larynx-voice box
6-esophagus-passageway for food
7-bronchus-branch from trachea
8-trachea-windpipe
9-diaphragm-lower chest muscle
Explanation:
definitions
Answer:
1-pharynx-back of throat
2-vein-transport of carbon dioxide in blood
3-artery-transport of oxygenated blood
4-pulmonary-lungs
5-larynx-voice box
6-esophagus-passageway for food
7-bronchus-branch from trachea
8-trachea-windpipe
9-diaphragm-lower chest muscle
hope i helped ;]
Explanation:
How do natural disasters weaken a community’s social infrastructure?
a.
Social systems are unbalanced by the damage caused by natural disasters.
b.
Natural disasters tend to target the poorest members of a community.
c.
The number of natural disasters is increasing across the globe.
d.
Natural disasters can cause billions of dollars in property damage.
Answer:
the correct answer would be D
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What is the primary benefit of continuing to use non-renewable oil, as opposed to using renewable sources of energy instead?
Burning fossil fuels releases carbon dioxide, which is essentially plant food that will lead to much greater productivity and quality of life on Earth.
It is not possible to run vehicles on renewable fuels, so there is no way to switch from using oil for that purpose even if renewable sources can be used for other things.
Oil is cheap and harmless to people and the environment, so it is an excellent source of energy over the long term and there is no need to develop renewable sources.
The infrastructure for using oil is already in place and there are costs associated with changing the energy infrastructure.
Answer:
The infrastructure for using oil is already in place and there are costs associated with changing the energy infrastructure.
Explanation:
The other options are stating false information.
Hope this helps! :)
Answer: The infrastructure for using oil is already in place and there are costs associated with changing the energy infrastructure.
Explanation:
Use of fossil fuels in considerably cheaper than the costs associated with the new technologies regarding renewable sources as it is very expensive to implement the new technologies and you do not see the benefits initially it takes a lot of time.
PLEASE HELP!! WILL GIVE BRAINEST
Which of the following is the desired outcome of attaching streamers to the back of boats?
Keeping birds from becoming tangled in fishing line
Providing habitat for lobsters
Reducing overall bycatch from drift netting
Removing floating debris from the water
Answer:
removing floating debris from water i do think is the answer if it is wrong i apologize.
Explanation:
Answer:
Keeping birds from becoming tangled in fishing line
Explanation:
There are some birds that take advantage of fishing boats to catch fish from the nets. They submerge at great speed under water. But many times they get caught. This is why streamers are placed, the movement of the streamers with the wind scare away the birds and prevent them from being trapped in the fishing nets.
Plants make their own food and are called producers. What do plants need to make their own food? A) soil, air and water B) soil, sunlight, and water C) sunlight, fertilizer, and water D) energy from the sun, air, and water
Answer:
D
Explanation:
A plant needs to use the energy from the sun to make glucose and other nutrients it needs. Air is needed for glycolysis and photosynthesis to occur. Water is needed by all living things to stay alive.
D because u need air water and sunlight for photosynthesis aka to make their own food
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A population of coastal fish show signs of die-off when there are no known predators or environmental stressors in the area. What is the most likely explanation for what has happened to this population?
The population reached carrying capacity for the area.
The population evolved with a shorter lifespan.
The population reached its emigration period.
The population evolved with new eating habits.
Answer: the most likely case would be that population reached the carrying capacity of the area.
Explanation:
Explanation:First off the population of the prey that is the "coastal fish" In this case will increase in population and acquire a greater area for their survival and will start to (die-off).when the predators in an area are reduced or get extinct this change triggers a reaction called as "tropic cascade" in the ecosystem in which the change in the predator population has affects on the food web.
For example :when the wolves were eliminatefls from the American west, there were changes in the elk population and the vegetation the elk ate.
Therefore both preys and predators balance each other.
How has technology benefited energy production? A. It has provided for the use of alternate energy sources that have reduced impact on the environment. B. It has allowed for the use of energy sources that are renewable. C. It has allowed for the improvement of existing methods of producing energy. D. All of the above Please select the best answer from the choices provided A B C D
In my opinion and thought I would go with all of above just because so much has benefited from technology and it so happens all of the above has happened
Answer: A. It has provided for the use of alternate energy sources that have reduced impact on the environment.
Explanation:
The technology can be define as the collection of skills, methods and techniques that are required and used for the production of goods and services and to accomplish the objectives of the scientific research.
The major advantage of the technology is the innovation and improvisation of the alternate resources which can be used for the generation of energy. The energy harnessed by these energy sources does not liberate pollution to the atmosphere, biosphere and hydrosphere hence, the quality of the environment remains maintained.
Gender stratification refers to the ranking of males and females according to their access to power, property, and prestige based on their sex.
True
False
Gender stratification refers to the ranking of males and females according to their access to power, property, and prestige based on their sex. false
Recall the following rules for base pairing in a DNA strand (note: not in an RNA strand):
dna pairs
Use the above to complete the following table: (remember I'm asking for DNA, so there are no U's)
Template Strand Complementary Strand
AAATT a.
CGCAT b.
GGGAC c.
ACGGT d.
Answer:
AAATT - TTTAA
CGCAT - GCGTA
GGGAC - CCCTG
ACGGT - TGCCA
Explanation:
In DNA, A and T, also known as adenine and thymine pair together and G and C, also known as guanine and cytosine pair together due to the hydrogen bonds formed between the two bases.
In which of the following cases does an atom have a positive charge?
A. There are more electrons than neutrons.
B. There are more protons than electrons.
C. There are more electrons than protons.
D. There are more neutrons than electrons.
Answer:
B. There are more protons than electrons.
Explanation:
When the number of protons is greater than that of the electrons, such an atom becomes positively charged.
An atom is made up of three main subatomic particles which are the protons, neutrons and electrons.
The electrons are negatively charged particles that moves round a central nucleus in an atom. They occupy the bulk of the volume in an atom. They are considered weightless relative the nucleons ie protons and neutrons.
The protons and neutrons are massive particles that occupy a tiny centre region in an atom. They are called nucleons and this is where the bulk of the mass of an atom concentrates. Protons have positive charges on them whereas neutrons have no charge on them.
In a neutral atom, the number of protons and electrons are thesame. Here, the positive charges cancels out the negative charges.
For a cation which is a positively charged ion, the number of protons are greater than the number of electrons. A cation must have lost an electron to have tripped the balance.
For anions which are negatively charged ions, the number of electrons are greater than those of protons.
Answer:
The answer is B
Explanation:
When you see an attractive person sit down next to you on the bus, the mad pounding of your heart is under the influence of the __________ nervous system?
Answer:
The correct answer is - autonomic nervous system.
Explanation:
The autonomous nervous system is a nervous system part that plays a role unconsciously in the body and maintains the functions of the body such as respiratory rate, urination, heart rate, sexual arousal and digestion, and other unconsciously occurring processes.
ANS is of two types sympathetic and parasympathetic both have opposite roles to each other. Sympathetic ANS are responsible for the increase in the heart rate in the influence of epinephrine and other hormones.
Thus, the correct answer is the Autonomic nervous system.
Which statements best describe natural selection? Check all that apply. Populations must have genetic variation. Genetic mutations do not produce advantageous traits. Natural selection occurs when the environment changes. Evolution works independently of natural selection. Organisms best suited for the environment survive and reproduce
Answer:
The answers are A, C, E.
Explanation:
My only explanation is I did the question wrong and got the answers...
A) Populations must have genetic variation.
C) Natural selection occurs when the environment changes.
E) Organisms best suited for the environment survive and reproduce.
Natural selection is the process by which organisms with advantageous traits survive and reproduce more successfully, leading to evolution. Genetic variation is necessary for natural selection to occur, and environmental changes can influence the process. Evolution entails shifts in genetic frequencies within a population as a result of differential survival and reproduction.
Explanation:Natural selection is a central concept in evolutionary biology that describes the process by which organisms with traits that better enable them to adapt to their environment tend to survive and reproduce in greater numbers. This process can only occur when there is genetic variation within a population. Mutations are a source of this variation, as they can produce new, advantageous traits that allow some individuals to have a higher rate of survival and reproduction.
However, it is important to understand that not all genetic mutations lead to advantageous traits. Furthermore, for evolution to occur by natural selection, there must be a change in the environment that affects the survival and reproduction of individuals with different traits. This process leads to a shift in phenotypic variations and eventually changes the genetic frequencies within the population.
In summary, natural selection acts on the population's heritable traits, where individuals that are well-suited for their environment are more likely to leave more offspring than those who are less adapted. Over time, this can lead to the evolution of the population as advantageous traits become more common and deleterious alleles decrease in frequency.
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What does population density measure?
the different species in a community
the number of individuals in a sample
the degree of crowding of a population
the area occupied by a population
Answer: the area occupied by a population
Explanation:
A population density can be define as the number of individuals of the population of a species living in per unit area over a particular time. Population density may vary depending upon the number of live births, deaths, number of immigrated and migrated members counted in concerned period of time.
Answer:
[tex]\boxed{\mathrm{the \ area \ occupied \ by \ a \ population}}[/tex]
Explanation:
Population density is a measurement of population per land area.
[tex]\displaystyle \sf population \ density =\frac{population}{land \ area}[/tex]
The population density of a place tells us whether the place occupied by the population is densely or sparsely populated.
Which gas in Earth’s atmosphere helps living things make proteins?
oxygen
nitrogen
water vapor
carbon dioxide
Answer:
nitrogen
Explanation:
Answer:
B.) Nitrogen
Explanation:
Hope this helps:)
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Timothy is planning to leave home to go on a long trip. His mother told him to take his cell phone in case of emergency. What is one way that cell phone technology may not be beneficial in this situation?
Answer:
d) Timothy may not have cell phone service in some areas
Explanation: USA Test Preps
Your mental health will suffer if you use your phone excessively. The excessive use of mobile devices over time increases anxiety, loneliness, and low self-esteem. When mobile devices aren't available, dependence on them can also lead to annoyance, aggravation, and impatience. Thus, option D is correct.
What cell phone technology not be beneficial in situation?The causes of poor mobile phone signal can be divided into two groups: geographical distance from or obstructions between your phone and the nearest cell tower, and localized poor coverage caused by building materials or destructive interference.
It's not difficult to get a cell signal in a lifeless area. All you have to do is spend money on a signal booster for your cell phone. A cell phone signal booster enhances cell service and enables users to access services in locations with little to no service.
Therefore, Timothy may not have cell phone service in some areas.
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People who have intermittent bouts of depression are less likely to get heart disease, atherosclerosis, hypertension, stroke, dementia, osteoporosis, and type ii diabetes.
a. True
b. False
B in my opinión i Believe it could be. What is this for ?
I think the answer is b
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Refer to the illustrations showing a sarcomere in two different stages to answer the question.
What does Stage 1 represent?
A. a muscle that is rotating
B. a muscle that is fully at rest
C. a muscle that is fully contracted
When the muscle is at rest, myosine heads are not interacting with actin. Stage 1 in the image represents a muscle that is fully at rest (Option B).
What are the components of the Sarcomere?In the sarcomere, we can identify the following components,
• A-band. This band reflects the length of the thick filament, including a small portion of the thin filament.
• I-band. This is the area located between the ends of the adjacent thick filaments. It is composed only of thin filaments.
• H-zone. This is the area located between the ends of the thin filaments. It is only composed of a portion of the thick filaments.
• Z-band is the vertical line placed at the end of each sarcomere. In adjacent sarcomeres, Z-band can be found in the middle of the I band.
How does muscle contraction occur?At restAt rest, tropomyosin is inhibiting the attraction strengths between myosin and actin filaments.
Tropomyosin is obstructing binding sites for myosin on the thin filament.
Contraction
During contraction, binding sites between myosine and actin become unblocked.
Myosin heads join to the uncovered actin-binding points forming cross-bridges. A power stroke initiates when this binding occurs. While the power stroke happens, myofilaments slide impulsed by chemical energy collected in myosin heads.
The muscular fiber gets shorter because the sarcomere reduces in length. The H line and the I band get shorter. Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction. A band keeps constant in length.
Stage 1 in the image represents a muscle that is fully at rest (Option B). Binding sites between myosin and actin are blocked.
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The graph shows the axis of symmetry for a quadratic function f(x).
Which could be the function?
f(x) = (x + 4)2
f(x) = x2 + 4
f(x) = (x – 4)2
f(x) = x2 – 4
Answer:f(x) = (x-4)^2
Explanation:
Did it on a graphing calculator
We can find the line of symmetry for a quadratic equation using the formula; x = -b / 2a.
What is line of symmetry?The line of symmetry in a quadratic equation is a vertical line that cuts the parabola. The question is incomplete hence the graph is not shown here.
However, the line of symmetry is always a real number such that x = n. We can find the line of symmetry for a quadratic equation using the formula; x = -b / 2a.
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What is the meaning of photosynthesis as example.
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Explanation:
Plant get food and energy and animal get oxygen.
In procedure b, which tube showed the most digestion of egg albumin? what can you conclude about the ph optimum of pepsin?
Answer:
Following incubation, the most digestion of egg albumin (protein) in exercise "B" occurred in tube 2. This shows that the enzyme pepsin has both a pH optimum (acidic) and a temperature optimum (37C).
If the bark of the trees is dark and the moths that rest there are light, what might happen to the moths
Answer:
They might get eaten
Explanation:
They won't be able to camouflage on the tree
If the bark of the trees is dark and the moths that rest there are light, it is likely that the moths will be more visible to predators while they are resting on the trees.
What happens to light colored moths on dark trees?If the bark of the trees is dark and the moths that rest there are light, it is likely that the moths will be more visible to predators while they are resting on the trees. The contrast between the dark bark and the light-colored moths could make the moths more conspicuous, making them easier to spot by predators such as birds or other animals that prey on moths.
Additionally, the moths may be more vulnerable to being detected by predators while they are resting on the trees because they are not able to blend in with their surroundings as well as they would if they were resting on trees with lighter-colored bark. This could make them more likely to be preyed upon and could potentially lead to a higher mortality rate among the moths.
It is worth noting that this is just one possible scenario and there may be other factors at play that could affect the moths' vulnerability to predators. For example, the presence or absence of other forms of camouflage, the behavior of the moths, and the density of the moth population could all play a role in their vulnerability to predators.
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In pea plants, the trait for tall stems is dominant over the trait for short stems. if two heterozygous tall plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?
Final answer:
When crossing two heterozygous tall pea plants, the expected percentage of offspring that would be tall like the parents is 75%, as determined by the Punnett square showing a genotypic ratio of 1 TT, 2 Tt, and 1 tt, with only the tt genotype resulting in a short plant.
Explanation:
When two heterozygous tall pea plants (Tt) are crossed, the likelihood of their offspring also exhibiting a tall phenotype can be determined using a Punnett square. A heterozygous tall plant (Tt) crossed with another heterozygous tall plant (Tt) would result in the following genotypic ratio: 1 TT (homozygous dominant), 2 Tt (heterozygous), and 1 tt (homozygous recessive).
Both the TT and Tt genotypes will display the tall phenotype, while the tt genotype will result in a short-stem phenotype. According to the genotypic ratio, we can predict that out of four offspring plants, three (or 75%) would be tall. This is because the 1 TT and 2 Tt plants all express the dominant tall trait. Therefore, the expected percentage of offspring that would have the same tall phenotype as the parents is 75%.
What is the purpose of the pericardial sac that surrounds the heart in mammals
Answer:
Pericardial sac has protective tole
Explanation:
Pericardial sac or pericardium is a fibrous tissue that surrounds the heart. It has two coats:
the outter coat-parietal pericardiumthe inner coat-visceral pericardium or epicardium which is double-layered and contains pericardial fluid between those two layers (pericardial fluid is necessary as a lubricant for the heart movement).Besides lubrication, percardium also protects heart from infections, fixes it and limits its movements.
If you compared two samples of dna at three different locations in the genome and found they had different lengths of short tandem repeats(e.g. microsateliites.) at each location, what could you conclude?
Answer: please search in wikipedia
What transports oxygen in the blood? white blood cells plasma platelets red blood cells
Red blood cells transport oxygen in the blood.
Answer:
red blood cells
Explanation:
Gene mutations can be passed on to future generations and drive natural selection. Choose the best description of how gene mutations are involved in evolution.
A. Gene mutations often skip generations, with advantageous traits showing up several generations after the gene mutation was first introduced.
B. All gene mutations are passed to future generations and over many generations will contribute to the evolution of new species.
C. Gene mutations can be dominant or recessive for an organism. Dominant genes will be adaptive for future generations, but recessive genes won't.
D. Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction.
Answer:
D
Explanation:
Natural selection, which powers evolution, favors traits in a population that offers an advantage in an environment. Mutations on genes that give advantage will, therefore, be preserved while those that are deleterious will be eliminated. For these mutations to be passed down generations, they have to be borne in gametes.
"The correct option is D. Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction.
To understand why option D is the best description of how gene mutations are involved in evolution, let's analyze each option:
A. Gene mutations often skip generations, with advantageous traits showing up several generations after the gene mutation was first introduced.
- This statement is not entirely accurate. While it is true that some gene mutations may not have an immediate effect and can be carried in a population for several generations before becoming prevalent, this is not a general rule for how gene mutations contribute to evolution.
B. All gene mutations are passed to future generations and over many generations will contribute to the evolution of new species.
- This statement is incorrect because not all gene mutations are passed on to future generations. Many mutations are neutral or harmful and may be eliminated from the population through natural selection. Only those mutations that confer some advantage are likely to be passed on and potentially contribute to the evolution of new species.
C. Gene mutations can be dominant or recessive for an organism. Dominant genes will be adaptive for future generations, but recessive genes won't.
- This statement is misleading. Whether a gene is dominant or recessive does not determine its adaptiveness. A recessive gene can be beneficial, harmful, or neutral, just like a dominant gene. The adaptiveness of a gene mutation depends on its effect on the organism's fitness in a given environment.
D. Gene mutations can be helpful, harmful, or neutral for an organism's survival. Only mutations that are helpful in the organism's environment would influence its survival and reproduction.
- This statement is the most accurate description of the role of gene mutations in evolution. Mutations that are beneficial (helpful) in a particular environment can increase an organism's chances of survival and reproduction, thereby passing those mutations on to future generations. This process of natural selection can lead to the accumulation of advantageous traits in a population over time. Neutral mutations may persist in the population without affecting fitness, while harmful mutations are likely to be selected against.
In summary, option D correctly captures the essence of how gene mutations contribute to evolution by influencing the survival and reproductive success of organisms based on the environmental context."