The cell wall is the answer since it is rigid.
There are three main types of mutation present for DNA. They are substitution, insertion and deletion. Substitution is the exchange of one base for another. Insertion happens where extra base pairs are inserted. Deletions are mutations where a section of DNA is lost. Therefore, the correct answer is substitution.
The correct answer is "acetylcholine".
Acetylcholine is the primary efferent neurotransmitter of the central nervous system. Acetylcholine functions in the autonomic nervous system as a neurotransmitter in the autonomic ganglia of both parasympathetic and sympathetic nervous system. It also functions as the primary neurotransmitter for the parasympathetic nervous system. Acetylcholine also functions as the neurotransmitter released by motor neurons at the motor end plate to stimulate muscle excitation-contraction coupling.
Answer: A primary caregiver
Explanation:
It is very important that an infant have a primary caregiver as they develop in their early childhood. This is because it will be easier for the infant to bond with the person and begin to trust them for their safety.
This will ensure that their brains develop much more effectively especially in the areas responsible for emotional and social interaction and attachment.