Leftover radiation from the big bang is your answer hope i helped
The answer is <span>-Only the few bacteria that were immune to the antibiotic survived and reproduced, making all their offspring immune to it as well.
Bacteria (or any other organism) are not able to make changes to their DNA in order to protect themselves or to learn to remove the receptors on their cell surfaces. If they were able to produce toxins against the antibiotics, they would all survive.
These leave the second choice as the correct answer. This is the real situation, and is a good example of natural selection.</span>
Answer:
The major functions of the circulatory system is it delievers oxygen and nutrients to cells and takes away wastes.
Explanation:
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They are formed into polymers.
The answer is 3
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