Question

why is energy flow through an ecosystem dependent upon continual energy transformations?

Explanation:

Energy cannot be recycled in an ecosystem. Producers capture solar - energy and convert it to chemical energy. As energy is passed through trophic levels (from producers to consumers and decomposers), it is lost as heat at each step. So, continual energy transformations (like photosynthesis and cellular respiration) are needed to keep the energy flow going.

Answer:

Energy cannot be recycled and is lost as heat at each trophic - level transfer, so continual energy transformations are required to sustain the energy flow in an ecosystem.