If there were no humans ever, then it is likely that some other type of animal might have evolved and developed to build cities and have stuff like humans have, though probably very different. If humans suddenly disappeared today, then it is likely that the trees and plants would start growing everywhere (like we see in abandoned villages or houses) and the animals would be able to spread about more and take up lots of space.
Hello Raif, we know that humans have caused many animals to go extinct! We also know that we pollute the air and cut trees down, making it difficult for animals to survive in their natural habitats (think of the monkeys and the loss of their trees). That said, the dinosaurs went extinct and we have nothing to do with it! There is such a delicate ecosystem on Earth that means that some animals die out that aren’t strong enough to survive. Humans do appear to be speeding up the extinction process at the moment in a way not reported before.
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