It is made up of all parts of the Earth where life exists.
Biosphere
An individual living thing that can be unicellular or multicellular
Organism
The basic structural and functional unit of life
Cell
It is made up of many groups of populations that interact in an area
Community
It contains all the communities that interact in a specific area.
Ecosystem
A group of organs that interact to perform a similar function
Organ system
What level of biological organization is made up of a group of similar cells that perform a specific function?
Tissue
What level of biological organization does the human heart belong?
Organ
How do you call a group of same species living together in an area?
Population