This system<span> helps the </span>respiratory system<span> by protecting the lungs. The circulatory</span>system<span> is very useful. This </span>system<span> transports the food nutrients, and oxygen to the body cells. It also delivers of carbon dioxide and waste products.
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Answer:
Antibiotics....................
D) In the past, accidental discoveries have played a major role in scientific progress.
Scientists never assume that existing scientific theories are perfect, although they explain a great variety of facts. You must be ready for new findings, which challenge accepted ideas. Unintentional findings have played an important role in scientific progress in the past. If all the results that were contrary to accepted theories were ignored, science progress would be severely limited.
The four subunits of DNA are adenine, cytosine, guanine, and thymine.
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Answer:
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Explanation:
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