What is the missing word
cells during development to perform different functions

Stem cells are cells that have not undergone differentiation . A cell which has not yet become specialised is called undifferentiated.

Explanation: hope this helps

Differentiate

Explanation:

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

d) center of the mid-ocean ridge

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