Rochelle is 38 years old, but her mental ability is measured as that of a second-grade child. rochelle would be classified as developmentally delayed.

Rochelle would be classified as moderately developmentally delayed.

Explanation:

Moderate mental delay is when a person has an intelligence quotient (IQ) between 35 and 55. Thus, affected people are slower to learn to speak or sit, but if given the proper treatment and support, they can live with some independence. These people tend to grow old, but keep a child's intellect in middle school. An example of this can be seen in the question above where 38 year old Rochelle, but her mental capacity is measured as that of a second grader.

People with this kind of mental delay may need a little help so that they can be integrated and independent in their basic daily activities, such as being able to communicate, for example.

b) the heart is a pump made of muscle and that is difficult to grow in the lab.