Pure substances can be elements made up exclusively of one kind of atom, or they can be compounds made up of molecules that include two or more elements. Mixtures can be homogeneous or heterogeneous depending on how finely mixed the components are.
I think it's A) Sunspots. I hope this helps:)
Ignoring air resistance, the bullet's horizontal velocity is constant:

In 1.3 seconds, we can expect it to travel

Elements that give up electrons easily are called <u>metals.</u>
hope this helps!