They have half the chromosomes in body cells. One half are from one parent the other half is from the other parent.
I really think it was Wundt. Not 100% sure though
D. doesn't lead to a productive end.
You have to answer that yourself
Answer: His tumbling experience
Explanation:
The tumbling experience is required to be determined as in tumbling one learn to show movement on the floor. They perform the stretching exercises, flips, somersaults, handspring and handsprings. One learn tumbling from childhood, till adolescence and adulthood one gets a good hold on the body and flexibility. So, Jerry must need to know about his tumbling experience about his body flexibility.