What will be the effect if endangered animals become extinct?

If some endangered animals were to become extinct the effect would be devastating. Each animal or plant has its own part to play in the food chain of a certain ecosystem. If you take that animal or plant away the ecosystem will most likely crash and never recover. This could cause the numbers of other animals or plants that previously had good numbers in the ecosystem to plummet rapidly. This could cause evn more extinctions.

Overall, it would most certainly not be good.

It would not be good, but species go extinct every day. It would be devastating if an animal like the deer or rabbit went extinct. Like you said, "If you take that animal or plant away the ecosystem will most likely crash and never recover. This could cause the numbers of other animals or plants that previously had good numbers in the ecosystem to plummet rapidly. This could cause even more extinctions." like if the deer went away, the animals the would rely on the deer would go extinct and so on, but if it didn't just rely on the animal, then the other animals would suffer because they are all being eaten up. and they might go extinct. then fore the animals lower in the food chain, they would flourish because nothing is threating their lives, and so on.

You could think of a billion ways that could be "devastating" but it would take to long to say it all...