When we think of respiration, we usually think of inhaling oxygen and exhaling carbon dioxide. Assuming that all of the CO2 we exhale is waste
from cellular respiration, how does the carbon atom in CO2 enter the body?
A. In a molecule of carbon dioxide
B. In a molecule of water
C. In a molecule of glucose
D. In particulate matter we inhale.

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.