This word has several variant forms.

Kuahha is an alternative form of Kuagga, an extinct animal.

The quagga is an extinct animal.

That species is on the verge of extinction.

This species is on the brink of extinction.

What does this shape represent?

This is a different problem.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

They walked down separate paths.

I think we should try a different method.