Most of the animals in existence today had their origins during the: A. Mesozoic Era
B. Cambrian Period
C. Cretaceous Period
D. Devonian Period

Which of the following is one of the four conditions necessary for natural selection to occur in a population? fewer organisms are born than the habitat can support mutation does not occur organisms have identical characteristics variation is inherited

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

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