What does the paramecium's contractile vacuole regulate inside the cell?
a. amount of food
b. amount of water
c. movement
d. reproduction

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

What causes darkening of the skin as melanin production increases

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?