Green light is least effective
If a repressor protein attaches to the operator, RNA polymerase cannot proceed to transcribe key enzymes needed by the organism. This can be seen in the trp operon in E .coli bacteria.
C the speed of the electric fan
Fan mail?
I am it sure but that is what you generally call it or just compliments
Homo Erectus beings were literally mixed between Ape and Homo Sapien but I could be wrong... Also they Were the cavemen of the Homo Sapiens to I believe. Hope my Opinion/Answer helped. :)