Four cars are positioned at the top of a hill. Which car has the most potential energy? A. a small red convertible
B. a small race car
C. a large SUV truck
D. a BMW

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.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?