How may we arrange levels of organisation in our biological world?

1 Answer

Atom #-># Molecules #-># Cells #-># Tissues #-># Organs #-># Organ Systems #-># Organisms #-># Population #-># Community #-># Ecosystem #-># Biomes #-># Biosphere.


I'm not sure where you wanted to start, so I started with the smallest unit the atom. Atoms are not alive.

Atoms combine to make molecules. Molecules are not alive.

Molecules combine to make cells. Cells are the smallest living things.

A group of cells combine to do a job is known as a tissue like muscles.

A group of tissues that combine to do a job is known as a organ like your heart, stomach, or lungs.

A group of related organs combine to make an organ systems. For example your stomach, large intestines, small intestines, liver, estophagas, and others combine to help you get nutrients and break down food. So theses organs make the digestive system.

Organ systems combine to make an organisms like human. Elephants, lions, tigers, and bears are different organisms.

Group of the organisms of same species are called a population.

Different species populations combine to make a community.

When you start to include abiotic factors (like rocks and water) with biotic community you are looking at an ecosystem.

Ecosystems of a particular climatic region form biomes - like a desert or a tropical rain forest.

And finally biomes combine to form the biosphere, which contains all living things on Earth.

Earth is referred to as Biosphere 1.