Write on word for the following.

1.	The number and variety of plants, animals, and other organisms	....................
2.	A group or class of animals or plants having certain common and permanent characteristics	....................
3.	The natural environment of a plant or animal species, where it lives, multiplies, and thrives naturally	....................
4.	The numerous species of plants living in their habitat	....................
5.	The numerous species of animals living in their habitat	....................