Which populations fill the niche of scavengers in a particular desert community? a. fat sand rats  only b. lappet-faced vultures only c. fat sand rats and barrel cacti d. lappet-faced vultures and fennec foxes

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.