The productivity of a freshwater ecosystem depends on water movement. In
which of the following freshwater ecosystems does water move constantly in
one direction?
O A. Bog
O B. Stream
O C. Marsh
O D. Swamp
SUBMIT

Answer:

Homologous structures can be described as the structures which are similar to one another present in different organisms. These similarities depict that the organisms might have a common ancestor i the past. For example, the forelimb of man, birds, dogs.

Analogous structures can be described as structures in different organisms which perform the same function but might not have a common origin. For example, the wings of bats and birds.

Answer:

C

Explanation:

Answer:C. White blood cells

Explanation:

The lymphatic system produces white blood cells or lymphocytes that gets rid of toxins in the body. Also it serves where lymphocytes make antibodies to combat pathogens invading the system.

Answer:

reactant

Explanation: water provides hydrogen during photosyn thesis for glucose

Answer:

List the inputs and outputs of photosynthesis. What part(s) of the plant are responsible for taking in each of the inputs?

6CO2 + 6H2O ------> C6H12O6 + 6O2

inputs                              outputs

6CO2= Carbondioxide(6 molecules of carbon and 12 molecules of oxygen)

6H2O= Water (12 molecules of hydrogen and 6 molecules of oxygen)

C6H1206= Glucose (6 molecules of carbon, 12 molecules of hydrogen and 6 molecules of oxygen)

6O2= Oxygen (12 molecules of oxygen)

The plant(s) part responsible for photosynthesis is the leaf because it contains the chloroplast that houses the chlorophyl which enable it to tap sunlight for photosynthesis to take place

Explanation:

Photosynthesis is a cellular metabolic process, regulated by enzymes, its inputs and outputs are the following:

Therefore, we can conclude that photosynthesis captures the light energy of the Sun and uses it to bind CO2 and form sugars.

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Answer:

Rex is not a Tyrannosaurus rex because each of his hands has three fingers. Tyrannosaurus had only two fingers on each hand.

Answer:

two fingers on one hand and two  on the other

Answer:

RNA polymerase is blocked by the repressor

The lac operon is on when the repressor protein get fallen off the operator.

An operon or a group of genes with a single promoter, which encodes genes for the metabolism and transport of lactose in E.coli and other bacteria. In the process, the group of three genes need to be turned on before the bacterium, that is, E.coli can utilize lactose as food.

In the absence of lactose, the lac repressor, that is, the DNA-binding protein combines with the region known as the operator that switches off the lac operon. When binding of lactose takes place with the repressor, it makes the repressor to fall off the operator, hence, turning the operon on.

Thus, when the repressor protein gets fall off the molecule, it shows that the lac operon is turned on.

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This is an example of Codominance inheritance

Explanation:

A correlation among pair of variants of a gene is termed as Codominance. Unit version of a gene is obtained by individual, designated an allele, from all parent. The ruling allele will be revealed,when the alleles are varied. They are screened if they are the outcome of the additional allele, termed recessive.

The appearance of the a allele is not disguised by another allele is the concept of Codominance  . When specifying alleles for codominance, the code is to practice a standard character to express dominant and recessive and do superscripts to describe the various codominant alleles.

Answer:

codominance

Explanation:

I took the test

Answer:

Firstly, water can mineralize the chemicals through hydrolysis. This is achieved through the reactive nature of Hydrogen. Upon reaction, the chemically available compound disossciates and mineralizes. Secondly, water can react with CO2 to form carbonic acid which is a weak acid. Although it gets partially ionized, it can dissocilate minerals such as CaCO3 in the rock with the passage of time.

Water plays an important role in the chemical weathering of rocks. Two agents of chemical weathering are hydration, where water molecules combine with minerals in the rock, and dissolution, where water dissolves soluble minerals in the rock.

Water is an important agent of chemical weathering in rocks. Two examples of chemical weathering agents are hydration and dissolution.

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Epigenetic regulation mechanism and Repressors and transcriptional activators allows eukaryotic organisms is to regulate genes.

Explanation:

The gene expression regulation process in eukaryotic cell is complicated than when compared to the gene expression regulation process. In the organisms like multicellular, the regulation of gene expression obtained by the proteins. The regulation of genes in this type of organisms doe not take single level of execution.

Before the transcription stage begins, the DNA access is initially regulated. This process of regulation is termed as epigenetic regulation. There are 20,000 genes that are encoded by the genomes in human beings. These are arranged in such a way that they will be used by the particular type of cells when there is any need.

Answer:

The answer is: Scientists can tell that punctuated equilibrium occurred if they examine the fossil record and see that one organism rapidly evolved different characteristics.

Explanation:

The theory regarding "punctuated equilibrium" followed after Darwin's Theory of Evolution. According to Darwin, species evolved over time. However, evidence supporting it is lacking when it comes to fossil record. He thought that this was because the fossils were incomplete.

Darwin's idea was contradicted by evolutionary scientists, named Stephen Gould and Niles Eldrege. According to them, species change after millions of years (this phase is called "punctuated") and their change is sudden (and not gradual). This sudden change is very rapid, thus causing a fewer number of fossils being left behind. Most species who undergo speciation, occur in a different geographic location, thus leaving only a few number of fossils.

So, this explains the answer.

Answer:

modern dogs evovled from grey wolves to modern dogs

Explanation:

Final answer:

Ripples in a pond and seismic waves both exhibit wave properties such as carrying energy and having transverse and longitudinal properties, but they differ in their mediums and in what they can reveal about the medium's structure. Seismic waves travel through solids and are used to study the Earth's interior, whereas water waves are restricted to the surface. Both types of waves can experience superposition, where they pass through each other without altering their individual properties.

Explanation:

The ripples moving through the water in a pond are similar to seismic waves traveling through the Earth in that both are forms of wave motion that carry energy away from a source through a medium. With water waves, the disturbance is in the surface of the water, while seismic waves involve disturbances in the Earth's crust and mantle. Water waves cause water molecules to move in a clockwise circular motion due to their transverse and longitudinal properties. Seismic waves also exhibit transverse and longitudinal movements but in solids, with different types of seismic waves (P-waves and S-waves) showing different motions.

However, there are important differences too. Seismic waves can travel through the solid Earth and are used to probe its internal structure. In contrast, water waves are primarily confined to the surface of the liquid and reveal less about the water's depth. Furthermore, when it comes to interference, water waves and seismic waves can exhibit superposition, where they pass through each other without being altered. This characteristic is shared with other wave types, including sound and light waves. Lastly, multiple ripples in a pond are formed from a single disturbance due to the interaction of reflected waves coming from the edge of the pond, while seismic waves typically propagate as expanding waves from an earthquake's epicenter with little to reflect from.

Answer:

There are different energy conversions which we encounter in day to day life. Some of them are:

1) We use chemical energy in the food to convert it into mechanical and kinetic energy which we need for walking to the school.

2) We use chemical energy to be transferred into electrical energy which is converted to light energy in our bulbs so that we can see.

3) We convert electrical energy in the toaster to thermal energy to make breakfast.

Answer:

A. changing

Have a magnifecent day!

Scientific knowledge is both long-lasting and always subject to change. This evolution is inherent to the scientific method which emphasizes constant testing, refinement, and modification of ideas based on new evidence or data.

The correct option is A: changing. While scientific knowledge can remain unchanged for a long time, it is always subject to change as new evidence or data emerges. Science is a dynamic and evolving field; scientists constantly test theories and hypotheses and refine them as needed. This is a cardinal characteristic of the scientific method: ideas must be testable and, as a result, potentially changeable. Hence, scientific knowledge is both long-lasting and always changing.

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Answer:

complex organ systems, nervous system, while complex organ systems are absent in jellyfish, Both squid and dolphin are triploblastic (having three tissue layers), while jellyfish is diploblastic (having two tissue layers).

Explanation:

Letter B in the cell diagram illustrating a stage of mitotic cell division indicates the centrioles.

One of the main functions of the centrioles during cell division in the animal cell is to help in the formation of spindle fibers.

The fibers attach to chromosomes at the centromeres during metaphase and their shortening leads to the pulling apart of sister chromatids. Continuous shortening helps chromatids to complete their migrations to the poles.

Centrioles are vital parts of the centrosomes and are found only in animals, fungi, and some algal cells. In the diagram, the two centrioles can be seen at the two poles of the cell.

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Final answer:

The Harrisons' actions of removing vegetation by the lake lead to sediment pollution, which can carry various pollutants into the water and disrupt the ecosystem. Option B

Explanation:

The real-world example of the Harrison's cutting down vegetation and leaving an open area between their house and the lake is an instance of sediment pollution. When vegetation that stabilizes soil is removed, there is an increased risk of erosion. Soil particles, also known as sediments, can be swept into the lake, particularly during rain events. This sediment can cloud the water, reducing sunlight for aquatic plants, and can carry other pollutants such as pesticides and bacteria into the lake. This process disrupts ecosystems and can lead to negative consequences such as turbidity and eutrophication.

Answer:

Of the three kinds of substances that make up matter in nature which one forms most minerals? Most minerals are chemical compounds.

Explanation:

Final answer:

Silicates, composed of silicon and oxygen, are the most abundant class of minerals in the Earth's crust, forming around 90% of it and contributing to the diversity of rocks.

Explanation:

Of the three kinds of substances that make up matter in nature, silicates form most of the minerals found in the Earth's crust. Silicates, a large and complex class of minerals, are composed of silicon and oxygen, with the most common type being the silicate mineral with a base structure of (SiO₄)⁴⁻. Silicate minerals, such as quartz and feldspar, constitute approximately 90% of the Earth's crust due to the abundance of silicon and oxygen. These minerals are not only significant in quantity but essential for creating a diverse range of rocks and subsequently the landscape of our planet.

Answer: Identity

Explanation:

Answer: identity

Explanation:

a p e x

The correct order is 2, 1, 5, 3 and 4.

As per Dalton’s theory, atoms were described as the indivisible and indestructible parts of matter which forms any object. But this theory was discarded.

Then came J J Thompson’s Plum Pudding model which described atoms as a mixture of positive and negative charges just like a pudding. But it was also discarded.

Then comes Rutherford's solar system model which described Atoms as mostly empty spaces where the nucleus resembles Sun with positive charge and electrons as planets revolving the sun.

The came Bohr’s theory which described the shells of Rutherford as specific energy levels, not just mere orbits. This led to explain flame colorings of many elements.

Then came Hizenberg's uncertainty principle and Schrodinger’s model of atom which basically described the quantam theory of atoms.

Cancer cells have gene mutations that turn the cell from a normal cell into a cancer cell. These gene mutations may be inherited, develop over time as we get older and genes wear out, or develop if we are around something that damages our genes, like cigarette smoke, alcohol or ultraviolet (UV) radiation from the sun.

Answer:

An Earthquake

Explanation:

Answer:

There are two events that occur underwater to cause a tsunami. The first occurs when there is a landslide on the coast and the water is pushed by the force causing a tsunami. The second is when there occurs a landslide right under the water causing the water to push due to the natural forces generated by the landslide

Explanation:

Sexual reproduction produces genetically different offsprings which do possess variations, hence better chance to survive in the environment.

Option C

Sexual reproduction is the process of reproduction where there's a fusion of gametes from a male and female of the same species, resulting in a zygote and eventually an offspring. Sexual reproduction is very advanced type of reproduction which is very expensive for an organism. Much of the energy of the organism is spent to produce gametes and other necessary processes for reproduction.

Gametes of the sexual reproduction is produced mainly by means of meiotic cell division. This involves crossing over and chaismata formation which helps in genetic variations in the offspring. These variations help the species to survive unknown changes in environment, and helps to adapt quickly lessening the chances of extinction. So sexual reproduction has modified various times in different groups of species.

Answer and Explanation:

Hydrogen ions in the thylakoid space form an electrochemical gradient because of the difference in the concentration of protons (H+) and the difference in the charge across the membrane that they create. This potential energy is stored as chemical energy in ATP through chemiosmosis. The hydrogen ions are allowed to pass through the thylakoid membrane through an embedded protein complex called ATP synthase. Energy from the electron fuels membrane pumps that actively move hydrogen ions against their concentration gradient from the stroma into the thylakoid space. The photon causes an electron in the chlorophyll to become excited.

The correct answer is B. The percentage of the population with white fur will decrease

Explanation:

In the case presented, the fur of rabbits is related to an adaptation to survive during different seasons. In this way, the white fur is needed during winters as this helps rabbits to camouflage in an environment of snow providing them with a survival and reproduction advantage. On the other hand, the brown fur is better during summer as they need to camouflage between the brown trees, grass, and plants.

According to this, if temperature increases and therefore snow decreases the rabbits with brown fur will prevail as this will make them more likely to survive and reproduce, for example, a rabbit with white fur would be easily found by predators if there is no snow. Thus, in this case, "the percentage of the population with white fur will decrease".

Adaptation is the process in which an organism adjusts itself to survive in its surrounding. Adaptation can be affected by climate, rainfall, predators, and temperature.

The population of rabbits will be:

Option B: The percentage population with white fur will decrease.

In the given case, the fur of rabbits ranges from brown to white. The changes in the fur colour are due to the adaptability of rabbits to the given environment.

In winters, white fur is by rabbits because it will help in camouflaging in a snowy environment, which will provide them high chances of survival and reproduction advantage.

Conversely, the brown fur will be better suited in the summer as they will be easily camouflaged in brown trees, soils, and plants.

The rise in temperature will cause a decrease in the rabbits with white fur. The brown fur rabbits will have more tendency to survive and reproduce in summers.

Thus, the population of brown fur will increase in high temperatures and rabbits with white fur will decrease.

Therefore, option B is correct.

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Answer:

Development delays

Explanation:

Cuz it effect the brain the most