I believe that the best definition of the word common in environmental science is a typical resource. A typical resource is a resource that is not hard to find and is very common. The answer to the question will hence be A.
The answer could not be the other three choices because a shared resource is a resource that is used by more than one organism in the environment. A worthless resource is one that has no use in the environment while a rare resource is one that is hard to find.
They have a mass for the particles
There are no totally elastic collisions
There are intermolecular forces
They have a magnetic attraction.
The intensity of the sound will increase more as the energy of the sound wave increases.
I hope this helps you:)
Atoms. Well, they can be broken down, but that won't happen that fast.