A constant in an experiment is <u>B. </u><span><u>the quantity that must remain the same</u>. If it is constant, it doesn't change, so it cannot be variable. D makes no sense.
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Teeth helps to make the food into small particles.Without make them small we can’t digest them and swallow properly.
Hence teeth is essential for digestion.This process takes in mouth.
B a virus inserts its genome into the host cell. A bacterium does not
Müllerian mimicry is the correct answer <3 :D