The main difference between terrestrial planets and gas giants is
a) the way they were formed.
b) the shape of their orbits.
c) the level of their density.
d) the plane in which they lie.

Terrestrial planets are:

Gas giants are:

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

your answer would be a, maximum exploitation of resources.