1
They are formed when atoms of different elements join to make the molecules of life.
2
Different populations living in the same area.
3
Bones are
4
This level is formed by several organs doing a specific function.
5
All the organs of the human body are made up of
6
All the tissues of the human body are made up of
7
These organisms are the first living things on Earth.
8
It´s the basic unit of the human body
9
The region on, above, and below the Earth's surface where life exists.
10
It's composed by many individuals of the same species.
11
It's the smallest particle of an element.
