18 1.66 points
In an ecosystem, energy
cycles along with chemical nutrients.
typically flows from consumers to producers.
typically flows from producers throught a series of consumers.
comes ultimately from bacteria.
enters as heat and exits as light.
19 1.66 points
The 4 most common elements in living organisms are
C, H, O, Fe
C, H, O, Na
C, N, O, Na
C, H, O, N
Fe, N, O, Ca