I think it's B. Because if you're wearing something that filters oxygen (E.g. gas mask) and the substance becomes airborne, the filters in the protective gear might be overworked if the substance density is greater than the filtering capacity.
Its a bit hard to explain BUT
The increased levels<span> of sex hormones </span> result in physical changes some of them <span>, including maturation of the breasts, and other places that im not gonna say. Normally, these </span>changes occur<span> sequentially </span>during puberty<span>, resulting in sexual maturity whic hmost ppl think only boys have but most girls do to . ...
Genetics can cause , </span>Puberty to happen <span> earlier in girls whose mothers matured early. so it could be earlier then teenage years depending on when the mother started</span>
Sign language. It uses only signs made with your hands. You do not have to hear to understand it.