An asteroid hitting the earth would cause a lot of dust, ash, and other debris to go into the atmosphere which would block the sun which would cause the temperature to decrease.
Animals cells do not have CHLOROPLASTS ( chloroplasts are mostly found in green plants cells which is called chlorophyll )
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Fish species B would make a better model organism because at the end they produce 100 eggs more than fish species A.Fish species B is more likely to survive than Fish species A.