Name: Classification of Animals
Uploaded: 2019-07-19
Duration: 5 min 49 s
Description: Adaptations have led to complexities in organisms leading to similarities and dissimilarities. This becomes the basis of classification. Learn it here!

Question

Describe the four different levels of organisation in Metazoans.

Accepted Answer

Metazoans, or multicellular animals, are organised into four different levels of biological organisation, each with increasing complexity and specialisation:

Cells: The basic unit of life is the cell, which is the smallest and simplest level of organisation in metazoans. Cells have specialised functions and can come in different types, such as muscle cells, nerve cells, and skin cells.

Tissues: Tissues are groups of cells that work together to perform a specific function. Different types of tissues include muscle tissue, nervous tissue, connective tissue, and epithelial tissue.

Organs: Organs are composed of two or more tissues that work together to perform a specific function. Examples of organs include the heart, lungs, liver, and brain.

Organ systems: Organ systems are composed of two or more organs that work together to perform a specific function. Examples of organ systems include the digestive system, respiratory system, circulatory system, nervous system, and reproductive system.

These levels of organisation build upon one another to form a complex and integrated multicellular organism. Each level is dependent on the lower level for its function and survival, and each contributes to the overall function and survival of the organism as a whole.

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