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multicellular

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Definition

Multicellular means that an organism is made up of many cells. This is in contrast to single-celled organisms, which are only made up of one cell.

Multicellularity is a major evolutionary advancement that has allowed organisms to become more complex and to live in a wider range of environments. Multicellular organisms can specialise their cells to do different jobs, which allows them to perform more complex tasks. For example, the cells in your body are specialised to do different jobs, such as carrying oxygen, fighting infection, and digesting food.

Multicellularity also allows organisms to grow larger than single-celled organisms. This is because the cells in a multicellular organism can work together to support the weight of the organism. For example, the cells in your bones work together to support your weight and allow you to move around.

Multicellularity is a complex and fascinating phenomenon that has allowed organisms to become the dominant life forms on Earth.

How can the word be used?

Animals are multicellular organisms.

multicellular

Different forms of the word

Adjective: Having many cells.

Noun: An organism that has many cells.

Etymology

The word "multicellular" comes from the Latin words "multi" (meaning "many") and "cellular" (meaning "of or relating to cells"). The Latin word "cellular" is derived from the Latin word "cellula" (meaning "little room").

The word "multicellular" was first used in English in the early 19th century to describe organisms that have many cells.

Question

What things are multicellular?

AQA Science Exam Question and Answer

Question:

Explain the concept of multicellularity in organisms and discuss its advantages. Provide examples of multicellular organisms and their specialised cells.

Answer:

Multicellularity is a biological phenomenon where organisms are composed of multiple cells that work together to form tissues, organs, and systems. This organisational complexity allows for the division of labour and the development of specialised functions within an organism.

One significant advantage of multicellularity is the increased efficiency in carrying out diverse tasks. Specialised cells, each optimised for specific functions, collaborate to enhance survival and reproduction. For instance, in humans, muscle cells are adapted for contraction, nerve cells transmit electrical signals, and red blood cells transport oxygen. This division of labour allows organisms to perform a wide range of tasks more effectively than single-celled organisms.

Examples of multicellular organisms are abundant. Animals like humans, dogs, and birds are multicellular, as are plants like trees and flowers. In these organisms, cells form tissues, which then create organs that serve different purposes. This intricate organisation enables complex life processes.

In conclusion, multicellularity is a fundamental characteristic of many organisms, enabling specialisation and cooperation among cells. This hierarchical structure enhances an organism's adaptability, survival, and reproduction by distributing tasks among specialised cells and tissues.