Where does the oxygen that is used during cellular respiration in animals come from?
A. ATP molecules in a mitochondrion
B. Air that is breathed in
C. Water molecules in a cell's cytoplasm
D. Carbon dioxide molecules in food and drink

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases