Why are some shellfish (ocean animals, like oysters, that have shells) in danger of going extinct? None of the above. Fewer sharks is disrupting the ecosystem for these organisms. C The ocean is getting too salty Carbon in the atmosphere is making the ocean more acidic and they can't build their shells. E Warm water is making less algae (food for shellfish)

It's option C

Explanation:

Ocean is getting acidic

The question is formatted a bit weird. Shellfish are in danger of being extinct because carbon makes the ocean more corrosive and acidic, making it harder for them to build shells.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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"a.) well–developed vascular system."