What are the 5 postulates to Natural Selection?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

The production of cells during mitosis into specialized function is recombination or differentiation

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