I think it’s nucleic acid
The third one is incorrect.
A plant releases oxygen during photosynthesis not carbon dioxide.
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Estrogen is made out of steroid hormones
Answer:
The circulatory system to provide this oxygen and to remove the waste products of metabolism.The exchange of gases between the blood and tissue cells is internal respiration.
Explanation:
the circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles
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