The answer is chicken pox
Answer:
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Explanation:
population enviaroment and development are co related with each other. there should be balance between population and environment for the development. If the population of any place is high and the environment is not friendly the developmental processes will not be succed and sustainable.
<span>the ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine.</span>
One is not highly visible and the other is visable