Amoebas prey upon algae in aquatic environments.
a. true
b. false

The food source of all Amoebas does not remain the same, but the method in which they consume their food does. This is called phagocytosis, which is a digestion method in which they surround the prey and consume it's remains. Amoeba in aquatic environments are known to eat many different types of food, including algae.

Ten percent of energy is transferred from sun to the level indicated.

The answer is hilum.