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The fall made animals and plants affected by disease. It was hard to get food,many things died and it also made some animals into carnivores.
They would know if they see anything like traces of water or anything else that would be nessecary for a living organism to have. They look for these with technology like the hubble telescope as well as the drone on Mars to gather as much information as possible.
Eukaryotic cells are cells that have all of the different kinds of organelles, like the nucleus. Also they at the cells that make up animals.
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A lot...... what is the paragraph
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From The School of Biomedical Sciences Wiki. Complementary base pairing is the phenomenon where in DNA guanine always hydrogen bonds to cytosine and adenine always binds to thymine. The bond between guanine and cytosine shares three hydrogen bonds compared to the A-T bond which always shares two hydrogen bonds.