a

The arrows show the flow of energy and why there are many more raccoons than grass plants in the ecosystem.
b
The arrows point in the opposite direction of the flow of carbohydrates, like glucose.
c
The arrows flow of energy show most of the energy goes to the highest level consumer.
d
The arrows represent the flow of energy in one direction from producers to consumers.

d

The arrows represent the flow of energy in one direction from producers to consumers.