Which of the following is the adaptation that allows animals to survive in high altitudes, which contain lower levels of oxygen? a. Migration b. Higher levels of hemoglobin c. Insulating feathers d. Higher body temperatures Please select the best answer from the choices provided A B C D.

Which of the following is true of metabolism in its entirety in all organisms? a) metabolism depends on a constant supply of energy from food. b) metabolism uses all of an organism's resources. c) metabolism consists of all the energy transformation reactions in an organism. d) metabolism manages the increase of entropy in an organism.