Atrait that is coded by many genes working together such as hair color or skin color

answer:

the correct answer is herydity

4. The exercises will help strengthen the pelvic floor in preparation for delivery.

Explanation:

Kegel exercises is done to strengthen the pelvic floor muscles so that it can support uterus, bladder, small intestine and rectum firmly.  

This exercise can also be referred as pelvic floor muscle training.  

If the nursing student gives the above facts stating the purpose of Kegel exercises, then the nursing instructor would understand that the student has well understood the purpose of  Kegel exercise.

Hence, option 4 is correct