Well, the most popular theory is the Big Bang Theory. This theory has made many people believe it and helped figure out the problem. Although, no one knows if it's true or not....
Answer:
They were not around at that time or either from it being so hot they just disappeared/melted.
Explanation:
Differences Between Bacteria and Viruses. There are a number of differences between bacteria and viruses. Viruses, for example, are as much as 10 to 100 times smaller than bacteria. ... While the RNA and DNA of viruses are enclosed in the protein coat, in bacteria, the genetic material floats in the cytoplasm.
<span>The net pressure gradient in the cardiovascular system is created by ventricular contraction.
Hope this helps! :)
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The answer this this is A. Cell