The problem of introduced species can potentially disrupt the balance of ecosystems.

Many native species live in this park.

He understands the risk of being infected with semen that contains HIV.

Tanemaru is my best friend.

His variety of pitches is very diverse, which troubles the batters.

This seedless grape is very sweet.

The United Nations Environment Programme is providing solutions to global environmental problems.

This document contains environment-dependent characters.

My grandmother drinks Panax ginseng tea every day.

Pentathlon is a competition that tests both physical strength and technique.