Researchers have agreed that approximately 80 percent of

a. an individual's intellectual development is determined by heredity.
b. approximately 80 percent of an individual's intellectual development is determined by environment.
c. intellectual development is determined equally by genetics and environment.
d. none of the above

The correct answer is option A. "an individual's intellectual development is determined by heredity".

Explanation:

There are multiple hereditary studies that look to understand in what degree certain traits are developed by individuals, either genetically or by the environment. In the case of an individual's intellectual development, most researchers have agreed that approximately 80 percent comes from the heredity. This is seen once the individual has reached adulthood, while 20% is seen in infancy and 40% in adolescence.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .