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The answer is: 3 tennis balls because there will be 4 ping pong balls used for every model and 12/4=3

Explanation:

Here ya go!

Explanation:

You would need only 2 tennis ball to complete the model. By splitting each tennis ball in half you will now have 4 parts. I have already glued the 12 ping pong ball together in a circular shape. I would then just glue the parts of the tennis balls on the ping pong mass is reference to the picture shown.

idk

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