A certain species of caterpillar has bright colors that signal that it produces a highly poisonous substance. Why is this signal important to natural
selection?
A. Predators will know that this caterpillar is a good source of food,
B. Predators that ignore the markings will die from the poison.
C. The bright colors help the caterpillars find each other and mate,
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D. The bright colors will make it easier to find this caterpillar.

D. Predators that ignore the markings will die from the poison

Explanation:

The rest of the answers would be negative attribute of the bright colors. Though C may seem correct, the trait of being highly colorful to signal poison has been seen in many other species of animals as well.

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