When a species is extinct, there are no more individuals of that particular species left alive.

An endangered species is one that is close to becoming extinct.

Some animals and plants become endangered or extinct when the environment changes too much and they are unable to survive in the new conditions.

Saving different species is important because:

1. If one species becomes extinct, it can affect other species in the community.
2. Having a variety of species provides resources for humans.

Animals and plants provide many useful resources for humans, including:

1. Food
2. Clothing materials (e.g., cotton from plants, wool from sheep)
3. Medicines
4. Biofuels

A gene bank is a facility that stores the genetic material of plants and animals, which can help save species from going extinct.

Gene banks help save plant species by collecting and safely storing seeds. If these plants ever disappear in the wild, the stored seeds can be used to grow new plants.

Gene banks help save animal species by freezing and storing animal sperm and egg cells. These stored genetic materials can later be used to create new animals if needed.