The coldest layer of the atmosphere is the crust because it the only layer that is cooler from the rest. The crust is also the top layer of the earth's layers..
the papillary and reticular layers pf the dermis.
Hope This Helps!
Answer:
An inducer (b) stimulates the synthesis of the needed enzyme.
Explanation:
A repressor is bound to the operator in the DNA chain inhibiting the synthesis of a needed enzyme. When the inducer binds to the repressor, this one change its shape and as a result, the repressor is not bound to the promoter anymore starting the synthesis of a specific enzyme.