What kind of waves are used by all of these communication tools
pls help quickly

Radio waves, microwaves, infrared and visible light can all be used for communication.

i think that c)gold was found there

but i am not sure

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products