During a trip to the beach, Allen finds a colony of sea anemones on a rock. These sea anemones are green and get their color from tiny single-celled algae that live in their tissues. The algae produce food for the anemones while the anemones provide a place for the algae to live.

Which parts of the single-celled algae are responsible for capturing energy?

1. nuclei
2. chloroplasts
3. mitochondria
4. cytoplasm