Monarch butterflies are protected from birds and other predators because of cardiac glycosides they incorporate into their tissues from eating milkweed when they were in their caterpillar stage. the wings of a different species of butterfly, the viceroy, look nearly identical to the monarch so predators that have learned not to eat the bad-tasting monarch avoid viceroys as well. this example best describes

The answer is Mimicry. This is when one organism has evolved to look similar to another organism, because the similarity gives the mimic a selective advantage, usually because other organisms in its habitat, such as a predator, would then respond to the mimic in the same way as it would to the organism being copied. Mimicry comes in several varieties; including Batesian mimicry, which is when a palatable organism mimics a species that is unpalatable to predators. Consequently, they are avoided by predators, increasing their fitness. An example of Batesian mimicry is depicted by Viceroy and Monarch Butterflies.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem