The correct answer is c. Genetic Variation. Bacteria are very numerous, ad random mutation of bacterial DNA generates a wide variety of change, including resistance.
If I am reading this right, I would say that that fiber would be a nerve.
The amount of cardiac tissue varies
The Andes. The Andes of South America is the longest mountain range in the world.
consumers are basically organisms that get all their energy by consuming, or eating other types of organisms or organic matter. most consumers prey on other organisms because they do not have the ability to produce their own energy or to obtain energy through inorganic sources.
