Scientists then used microscopes to develop which of the following major scientific theories? a. the theory of thermodynamics b. the cell theory c. the theory of plate tectonics d. the big bang theory

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.