Coral reefs have a symbiotic relationship with algae. because of human activity, the ocean is absorbing high levels of , which causes an increase in ocean temperature. due to these unfavorable conditions, corals expel algae, leading to .

Coral reefs have a symbiotic relationship with algae. Because of human activity, the ocean is absorbing high levels of carbon dioxide, which causes an increase in ocean temperature. Due to these unfavorable conditions, corals expel algae, leading to bleaching. If corals go too long without algae, the corals will die. 

1 is carbon dioxide

2 is bleaching

Cis your correct answer

Transpiration is the answer