biology

The scientific truth of evolution is so thoroughly confirmed as to be beyond any possibility of dispute, and essentially irrefutable.

By the way, the reason fish gills are bright red is that, like lungs, many capillaries are gathered there.

It's because there were no large carnivores on the island of New Guinea.

That's because humans are mammals.

Bats are actually mammals, just like us.

Why is it that some plants become annual herbs while others become perennial woody plants?

That soil is rich in humus.