When testing the effect of penicillin on the growth of E. coli, penicillin would be considered the? A. independent variable B. dependent variable C. constant

Which image shows labeled organelles that are present only in plant cells?

At which location in earth’s interior does the top density continue to increase as thickness decreases?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?