Ecologists measure the population density by using the Quadrat method and the Mark and Recapture method.
Factors in an enviroment change so species also need to evolve
Answer: Lactose intolerance is caused by a deficiency of the intestinal enzyme lactase that splits lactose into two smaller sugars, glucose and galactose, and allows lactose to be absorbed from the intestine.
It is the root because it starts thre
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