The spinal cord is at work
Answer:
B. It allows for genetic variation.
Explanation:
As prophase progresses, homologous chromosomes come to lie side by side and become intertwined rather like a zipper. This process is called synapsis. During synapsis, homologous chromosomes exchange genetic material between one another which allows for genetic variation. This exchange is called crossing over.
N2(g) + 3H2(g) <--> 2NH3(g)
Bear in mind that this is a reversible reaction.
I believe the answer is luteinizing hormone. Luteinizing hormone also known as lutropin is a hormone produced by the anterior pituitary gland. The hormone is considered a gonadotrophic hormone because of its role in controlling the function of ovaries in females and testes in males which are known as the gonads. In females it controls the length and sequence of the female menstrual cycle, including ovulation, preparation of the uterus for implantation of a fertilized egg, and ovarian production of both estrogen and progesterone.