Weight is a measure of the:
o amount of matter in an object
o force of gravity on an object
o height and length of an object

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

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.