D is the best answer
(I am just using my common sense)
Hope I helped :)
The answer is when levels of the amino acid are high, it binds to the repressor, ending the synthesis of this amino acid
Only toms idea could be scientific since it is testable, can be tested by others, have a hypothesis, and be proven
Answer;
-Latitude
Explanation;
-The distance, measured in degrees, north and south of the equator is referred to as latitude.
-Latitude is the measurement of distance north or south of the Equator. It is measured with 180 imaginary lines that form circles around the Earth east-west, parallel to the Equator. These lines are known as parallels. A circle of latitude is an imaginary ring linking all points sharing a parallel.
-The Equator is the line of 0 degrees latitude. Each parallel measures one degree north or south of the Equator, with 90 degrees north of the Equator and 90 degrees south of the Equator.
