<span>Some antibiotics are almost useless, because pathogens have developed a resistance to these antibiotics.
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Answer:
Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.
Explanation:
<span>cell must divide. ....................................</span>
One difference between DNA and RNA is the sugar. Whereas the sugar in DNA is deoxyribose, the sugar in RNA is ribose. ... The bases found in DNA are guanine, cytosine, adenine, and thymine. The bases found in RNA are guanine, cytosine, adenine, and uracil.
