They have half the chromosomes in body cells. One half are from one parent the other half is from the other parent.
C should be the answer because in that example he is not prepared nor is his flexible easily flexible by him being out at the movies on a weekend that he is on call. It shows the importance of needing to be flexible and easily adaptable in case of emergency.
Encouraging interactions that arouse the 5 senses in order to increase development and provoke learning.
