If you mean a specific system then the reproductive system...but i haven't the slightest idea as to anything else to do with your question...
Answer:
a&b blood
Explanation:
because it needs to be half mother and a father blood that why my answer is a&b blood
The answer is A The amino acid inactivates the repressor
The SI unit of temperature is the Kelvin. Although the Celsius temperature scale is also used, it is considered a derived SI unit and is generally used to measure everyday temperatures.
the answer would be the ability to change skin color i think
