Considering the study of anatomy and physiology, what represents the most basic structural units of life?
a. cells
b. membranes
c. organs
d. vessels

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above