what two ways do phytoplankton use carbon?\nphotosynthesis\nrespiration\ncalcium carbonate shells\nfood

what two ways do phytoplankton use carbon?\nphotosynthesis\nrespiration\ncalcium carbonate shells\nfood
Answer
Brief Explanations:
Phytoplankton use carbon for photosynthesis to produce energy and build calcium carbonate shells for structure and protection. Respiration releases carbon and food is not a way they use carbon in the context of carbon - utilization mechanisms.
Answer:
photosynthesis, calcium carbonate shells