In photosynthesis, what gives energy to the electron moving through the electron transport chain?

Which direction does the energy flow in this energy pyramid ?

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping