Asubstance that enters earth's cycles and does harm to living things is
a. hydrogen.
b. a pollutant.
c. freshwater.
d. oxygen.

How do cells grow and reproduce to maintain homeostasis?

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

Speed is the ratio of the distance of an object moves to