I believe this is a bit of a trick question, while you are right about both B and D, they both preexist they just develop into other structures. I believe the correct answer is A since the nerve cord is hollow not solid.
<em>enzymes are protein in nature and they are actually the catalysts ..their function is to speed up the chemical processes taking place in the cells different enzymes like protease , transcriptase work on their specific functions and make the cell functions run faster ..</em>
Answer:
Las teorías extraterrestres o de panspermia sugieren que la vida existió en el espacio exterior y fue transportada por meteoritos, asteroides o cometas a una Tierra receptiva. En este caso, el origen de la vida no está relacionado con los posibles entornos de la Tierra primitiva.
Explanation:
"antigens"
Hope this helps!
-Payshence xoxo<span>
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False not True
Hope it helped. :D
