C. Males have two different chromosomes
Males have an X and Y chromosome, unlike females who have two X chromosomes.
The correct option is D.
Enzymes are biological catalysts that speed up the rate of biochemical reactions in living cells. Most enzymes are made up of proteins. There are different types of enzymes and each perform specific functions under specified conditions.
A reflex is involuntary however, other actions are voluntary in nature
A reflex action is an involuntary and almost instantaneous movement in response to a stimulus. It usually does not require any thought or input and therefore does not directly involve the brain.
The path taken by the nerve impulses in a reflex action is called a reflex arc. Most reflex arcs involve three neurons. There are two types of reflex arcs namely autonomic reflex arc which involves the inner organs of the body, and somatic reflex arc, which involves muscles.
I don't know much about bio, but for this your answer is skin. This is because it is the outer layer.
Hope this Helps!
~JaredEkey