1. which of these describes a chemical
change?
a. frost disappears from a window in
the morning
b. a silver spoon that tarnishes over the
years
c. a decrease in temperature reduces
the volume of a gas
d. a cup of hot tea cools down

idk

explanation:

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.