Where are the choices? What following answers?
Answer:
wrong subject and none of theses is the answer :(
Answer:
Carbon dioxide
Explanation:
The alveoli picks up the oxygen you breathe in and releases the outgoing waste product carbon dioxide
Answer:
A shark's skeleton is made of cartilage , a type of strong but flexible tissue .Most other fish are covered in smooth , flat scales . A shark is covered in sharp , toothlike scales called denticles . Most other fish have flaps over their gills.
Explanation:
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