A(n) is a group of organs that work together to perform a common function

Cell
Tissue
Organ
Organ system

Tissue

Tissues are groups of similar cells that have a common function. The four basic tissue types are epithelial, muscle, connective, and nervous tissue. Each tissue type has a characteristic role in the body:

Epithelium covers the body surface and lines body cavities.

Muscle provides movement.

Connective tissue supports and protects body organs.

Nervous tissue provides a means of rapid internal communication by transmitting electrical impulses.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

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