Question

what benefit do zooxanthellae get from their mutualistic relationship with corals?
oxygen
lower ph
color
sugars from photosynthesis
carbon dioxide

Explanation:

In the mutualistic relationship between zooxanthellae and corals, corals provide a protected environment and carbon - dioxide for zooxanthellae. Zooxanthellae perform photosynthesis. Corals respire and release carbon - dioxide which is used by zooxanthellae in photosynthesis to produce sugars. The corals also provide oxygen from their respiration which is beneficial for zooxanthellae.

Answer:

oxygen, carbon dioxide