Answer:
c
Explanation:
the answer would be time everyone with a stop watch
It means that only those who are able to adapt with all conditions they are placed in will be able to live.
Answer:
1) They have a notocorda that serves as support through the back of the fish.
2) Gill bags. These organs are responsible for filtering the oxygen in the water.
3) A pineal eye that is sensitive to light.
4) A cartilaginous skeleton.
Explanation:
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➷ It makes the circulatory system more efficient and helps to keep a constant body temperature. It allows an efficient supply of oxygenated blood to the body cells.
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Plants release oxegen for cellular respiration not carbon dioxide
