Biology is the study of life. Due to the fact that life is together a vast topic, researchers break the down right into several different levels of organization to make it easier to study. These levels start from the smallest unit of life and work approximately the largest and also most vast category.

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The levels, from smallest to largest, are: molecule, cell, tissue, organ, body organ system, organism, population, community, ecosystem, biosphere.

Molecules are made of atoms, the the smallest unit of chemistry elements. They can be discovered in every matter, living and non-living. Molecules comprise the most basic structures of living beings. Two biological disciplines that focus on this level are biochemistry and also molecular biology.

A cell is the basic unit that life. There are two type of cells: tree cells, which have a rigid cell wall surface made the cellulose molecules, and animal cells, which have flexible cabinet membranes. Cabinet biologists think about questions such together metabolism and also other questions about structure and role within and also between cells.

Tissue is do of cells that occupational together to perform a specific task. Muscle tissue, connective tissue, and neural tissue are some species of tissue. Histologists are an instance of biologist who job-related at this level.

An organ is a mechanism of organization that work-related together on a bigger scale come do certain jobs in ~ an animal"s body. Examples of organs space the brain, heart and lungs. Anatomy is an example of a biologic specialty concerned with this level.

An organ device is a group of organs that job-related together come perform certain bodily functions. The respiratory tract system, because that example, offers the lungs, airways and respiratory muscles to breathe oxygen and release carbon dioxide in animals. Physiologists research the function of parts of the body as they occupational together. Though physiologists have the right to work at any type of level of biological organization, they often answer inquiries related to body organ systems.

An organism is a recognizable, self-contained individual. Organisms deserve to be unicellular organisms such together bacteria or amoebae, or multi-cellular organisms consisted of of organs and organ systems. A person being is an example of a multi-cellular organism.

A population is a team of multiple biology of the same species within a particular area. For example, a pride of lions in Kenya, Africa, is a population.

A ar consists of every the different species within a certain area. The population of lions in Kenya, to add the populaces of gazelles, giraffes, elephants, dung beetles, and also all other types in the area, add up come a community.

An ecosystem is comprised of all the areas in a details area, and all the non-living, physical contents of the environment. Rocks, water and also dirt space a part of one ecosystem. Ecologists may study populations, communities, or whole ecosystems.

The biosphere is all of the ecosystems ~ above Earth added together. Every animal, plant, bacteria, rock, and also molecule is a component of the Earth"s biosphere. Non-biologists, such as meteorologists and also geologists, may join biologists come answer inquiries at this level of biology organization.

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Nikole Yearout began writing in 2003. She writes for assorted websites, covering whatever from maritime biology to digital programming and also book publishing. Yearout is pursuing a Bachelor of arts in creative writing from Washington State University.