Concept:The nymph grows by shedding its rigid exoskeleton through a process called moulting.
Explanation:The insect nymph, such as a cockroach, has a hard outer exoskeleton that cannot expand.
As the nymph grows, this rigid covering becomes too tight.
To increase in size, the nymph must repeatedly shed its old exoskeleton.
This shedding process is known as moulting or ecdysis.
Each moult allows the body to enlarge before the new exoskeleton hardens.
Moulting occurs several times before the nymph becomes a fully developed adult.
Thus, the key growth process in the nymph before adulthood is moulting.
Answer:C. moulting
