Internal means its on the inside
external means its on the outside
so an internal regulator is when the proteins respond to events on the inside of a cell
and an external regulator is when the proteins respond to events outside the cell
Key is to lock as D. Substrate is to active site.
<span>Almost all weather occurs in the lower layer of the atmosphere (the Troposphere), with the exception of large storms like hurricanes or large thunderstorms (whose clouds have great vertical development and reach the Stratosphere.)</span>
Activational effect is the correct answer.
Activational effect is an impermanent hormonal effect that leads to a change in physiological activity or behavior in both humans and adult animals. For instance, when testosterone levels rise in male songbirds they become more aggressive and tend to engage in courtship behavior. Also, a pregnant woman may get more emotional than usual due to an extra level of progesterone and estrogen during pregnancy.
