The comparisons would have the greatest effect on our ability to predict the efficacy of the sunscreen on humans is pigs and humans have very similar fat percentages in their bodies.
Sunscreen is a cream that protect the skin from the UV rays of sunlight and prevent tanning of the skin.
Before, the products available for people, the products are generally tested on animals to verify any side effects or effect of cream.
Thus, the correct option is D.) Pigs and humans have very similar fat percentages in their bodies.
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