Oxigen ,nitrogen ,carbon,and hydrogen.
<span>The most primitive vertebrates whose reproductive pattern includes the amniotic eggs are the reptiles.
An amniotic egg is filled with amniote, which are these membranes that have fluid in them. They serve to protect the embryo and enable it to survive any harsh conditions that may harm it. These cells have protein shells as well as calcium that provide further protection.
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Answer:
In science, a variable is any item, factor, or condition that can be controlled or changed
A spherically shaped bacteria are known as cocci..
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