If humans evolved from monkey's/apes, why are they still here?

Answer 1

Because you're starting from a false premise.
First of all there is a difference between monkeys and apes - second, no one said humans evolved from gorillas.
Evolution suggests humans and gorillas have a MOST RECENT COMMON ANCESTOR which basically only says we are more closely related to Great Apes than we are to Birds, Dolphins, Mice, Pigs, etc.
The lineage of homo sapiens has a long history punctuated with gaps that are constantly being researched. Humans belong to the subfamily Homininae (the "hominines") - which is used to refer specifically to the African apes; chimps, gorillas and humans, which separated evolutionarily from the Asian (Orangs etc.) apes around 13 million years ago. So - better to educate yourself first before asking the question thousands before you have asked without really trying to understand what you're questioning first.

Answer 2

Because of *branching*. This is an absolutely essential part of evolution, that many people fail to understand.

A species doesn't just evolve into something else. It that were true then logically there would be only one species on the planet!

Instead, a species will often *branch* into two species that each evolve very differently ... until millions of years later the descendants of the two branches are as different as humans and howler monkeys.

And along the way, each branch splits again into more branches. And each branch splits again.

That is why we have so many species.

Why does a species branch? Many reasons. But the simplest reason is that two subpopulations of a species get separated from each other. For example, they may live in a certain kind of jungle above a certain elevation, and if climate change kills the jungle terrain in the valleys, the species may therefore become isolated in separate pockets in the mountainside jungles. Millions of years later they are all separate species.

Evolution makes no sense without branching. But once you understand branching, questions like this are trivial to answer.

Answer 3

Humans are still here because there has been no extinction event that would have destroyed the species.