Explanation:
Theo Anh (Chị), tại sao nói An ninh hàng không
được xem là yếu tố sống còn ? Đảm bảo an ninh hàng không là gì ?
the answer is D.
In only polling people in Arizona, you aren't taking a representative sample of the total population. You want to represent all *U.S.* adults.
What if people from Arizona spend proportionally more (or less) than the rest of the nation?
A three-dimensional space where an electron spends most of its time with no more than 1 other electron, forming a pair
That's more than 275 million stars per day in the observable universe. Stars keep themselves fueled. They fuse elements together to make new elements.Once the star runs out of hydrogen, the helium atoms fuse together to make carbon.
