Because it is the control center for many hormones
Answer:
Breed "pure" mice with known genotypes that exhibit specific fur and eye colors, and learn how traits are passed on via dominant and recessive genes. Mice can be stored in cages for future breeding, and the statistics of fur and eye color are reported every time a pair of mice breed.
Leftover radiation from the big bang is your answer hope i helped
Extinction and speciation rates.
