Energy:

a) recycles continuously through an ecosystem
b) is used over and over again
c) flows in only one direction through an ecosystem
d) tends to be concentrated by living organisms

Option C.

Energy flows in one direction in ecosystem.

Explanation:

In the ecosystem, energy flow in one direction. Energy is transfered from one trophic level to another.

Energy is transfered from producers, majorly plants,convert sunlight to chemical energy during photosynthesis and transfer it to herbivores( goat, sheep ) when they eat plants,the herbivores after using the energy transfer energy to the carnivores when the carnivores feed on the herbivores and to decomposer who feed on dead animals.