: In order to push a pile of crates forward, a student applies a force. There is a friction
force that pushes backward on the crates with a magnitude half as much as the force
from the student. If the student pushes with a force of 300 N to the right, the net
force on the crates will be ---

Hahahah jsu’s hsjshshsh. shjshshshsh.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.