An unlearned behavior directly linked to a stimulus that is carried to completion once initiated and is essentially unchangeable is see concept 51.1 (page 1138)

A fixed action pattern is a behavior that is carried out to completion once started, regardless of changes in the original stimulus and the sequence is unchangeable. The unlearned behavior of fixed action patterns are triggered by a type of external stimulus that start off a particular organism.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.