Why does the section of the graph labeled A seem to go up and down as time passes?

Aphids are tiny insects that feed on plants. ladybugs are to plants because they eat aphids. which type of organism are aphids in this scenario? co decomposers predators prey producers

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

Which direction does the energy flow in this energy pyramid ?