What was the" cause of the mutation" in huntington's disease?

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

Jasmine, at 33 months of age, is able to engage in some self-care behaviors but still has trouble with tasks such as putting on socks. a few months later, she accomplishes this same task relatively easily. the change in abilities is most likely due to