Why do some siblings devolop wayy faster than others?

like if one sister gets her time of year at 16 and the other at 10 and stuff like that, i thought it be based on genetics
Answers:

Is anyone on the pill to control throbbing periods? Does it work and what are the side effects? Thanks?

it is base on genetics. thats close to asking why is one sister blonde and the other brunette. you share the same blood flash but not the exact same DNA.

Why My period have not came on?

Everyone grows at different rates, no event what. Even if your mom got her time at 13, her daughter could get at 10, it is never impossible to tell apart. There DNA decides for them.

What could inflict a late extent?

It does have to do near genetics...but it can also depend on the physical pursuit differences between the siblings, and also the amount of body fat...ect.

Menstrual Cramps?

it's base on genetics, diet, exercise, simply anything that will affect your period

How long can I walk without intake?

I may get a destruction threat for this one, but I really believe that life experiences, can trigger faster (or slower, if you will)growth because existence experiences are interpreted through the brain. For example, maybe your 10 year infirm sister saw a glimpse of a full naked man on a movie low when she was immature, That causes a adjustment in someones belief system because it is an self-conscious knowledge going on for something she didn't know anything about. And, mind you, only just an example, and I think belief systems that stem from the brain can trigger the hormones that the brain would deem appropriate for the experience. Age doesn't own much to do with it.