On cold days, warm coffee is the best.

On a cold winter night, hot cocoa is the best.

The cold has become severe.

It's difficult to go outside in this coldness.

I saw many animals at the zoo.

This forest is a habitat for many kinds of animals.

Kangaroos and wallabies are an example of parallel evolution.

Convergent evolution refers to the phenomenon where different organisms develop similar features to adapt to the same environment.

He is reading a book about the theory of evolution.

A drop of water fell from the cup.