Car companies build wind tunnels to test the aerodynamics and the handling capabilities of their car designs. the many variables that can be precisely controlled inside the wind tunnel are considered factors.

they are considered ENDOGENOUS factors.

Explanation: An endogenous factor is an influence that is originated from within a system.

The wind tunnels used to test the aerodynamics has different types of influence controlling it. Some might be exogenous (originating from outside) or endogenous (originating from inside).

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.