67. In the mitochondria of cells, oxygen is used to
A make sugar from carbon dioxide,
B prepare cells for mitosis.
C get energy from sugar.
D make copies of DNA.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

hope this

tobey

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b