Answer:
DNA is a long polymer with deoxyriboses and phosphate backbone. Having four different nitrogenous bases: adenine, guanine, cytosine and thymine. RNA is a polymer with a ribose and phosphate backbone. Four different nitrogenous bases: adenine, guanine, cytosine, and uracil.
Homeostasis is the process by which organisms keep internal conditions relatively constant<span> despite changes in external environments. Homeostasis in the body is maintained by feedback loops.
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Answer:
I guess (D)
Explanation:
Linnaeus' hierarchical system of classification includes seven levels called taxa. They are, from largest to smallest, Kingdom, Phylum, Class, Order, Family, Genus, Species.
<span>b. Millions of coal fires and stagnant air caused toxic fumes to build up in the air.</span>
