What do live animals produce that is another reservoir of nitrogen?

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs

How many copies of genes do gametes have?

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei