What are organs made of?

A. Nonliving material

B. Systems

c. Reflexes

D. Tissues

Which statements correspond to cellular respiration? co2 diffuses passively into the cell. co2 diffuses passively out of the cell. co2 must be pumped out of the cell. o2 diffuses passively when produced inside the cell. o2 diffuses passively when converted to co2. o2 is pumped in and forces co2 out.

If we assume that, in the african savanna, rainfall and the amount of grass is plentiful, what other factor would best explain a reduced antelope population?

Approximately how much solid waste do americans produce annually? a) 250 tons b) 250 thousand tons c) 250 million tons