Identify the level of biological organization being referred to in each
description. Write your answer on the line before the number.
1. The collection of all ecosystems on Earth
2. The basic structural and functional unit of life
3. The level where heart, brain, and liver belong
4. A life-form composed of different organ systems
5. A group of organs that work together to perform
a specific function
6. A group of tissues that work together to perform
a particular function
7. All the living organisms and the nonliving factors
in their environment
8. A group of cells that perform specific functions
such as protection and support
9. A group of organisms that belong to the same
species living in the same geographical area
10. Different populations of different species inter-
acting with one another and their environment
in a given geographical area​