Rats account for a decent amount of biomass globally. They are intermediate predators, eating a lot but also being eaten. If they went extinct, they would stop eating many insects and seeds / fruits -- the former would gain significantly in population, and the latter would lose some of their pollination. Both factors would harm the viability of at least some species of plants, by adding to plant eaters (insects) and reducing plant reproduction. Rats' predators would also suffer if they went extinct. The primary predators are birds of prey, such as hawks and owls. However, other animals such as skunks, foxes, weasels, coyotes, and even wolves eat rats. For predators in marginal environments, the loss of such a food source could drive them out of a habitat area.
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Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. Magnesium is an important component of chlorophyll. The concentration of magnesium ions is higher in the root-hair cells of plants than in the soil.
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A strand of DNA comprises pyrimidines, that is, cytosine and thymine and purines, that is, adenine and guanine. Of these pairing takes place between thymine and adenine and guanine and cytosine. Thus, it can be said that in DNA, the amount of adenine is corresponding to thymine, and the concentration of guanine is corresponding to cytosine. Hence, the given first statement is correct.
DNA gives an appearance of a helical structure, in which each of the helices comprises approximately 10 nucleotides within them. Hence, the given second statement is also correct.
The strands of DNA found in a helical structure are complementary to each other, or it can also be stated that the nucleotides present in one strand of the DNA are found in opposite direction and orientation with respect to the second strand of the DNA. The phosphodiester bonds play an essential function in combining a molecule of sugar of one nucleotide with the molecule of phosphate of the adjacent nucleotide. Hence, the given fourth statement is also correct.
The correct answer is letter C.
Deep sea coral reefs provide a critical habitat for many other organisms. These organisms are also known as cold-water corals that are found in the deeper and darker parts of the oceans where temperatures are extremely cold.
