Why is it important to test models during the testing step of the engineering process? Choose two answers. A.
to define the problem

B.
to see if models solve the problem

C.
to see how much the materials will cost

D.
to see how models could be improved

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hello there the answer is d

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

your answer is going to be physical weathering