The atomic number is the same as the number of protons, so the answer is 25.
A because a primary source is defined as a first hand account of an event .
The answer is B,This is an example of convection, where fluid will circulate.This is because when part of air is warmed up, they expand and become less dense then rise,Therefore, the colder air contracts and become denser and sinks, in order to take in the place of the warm air. This phrase circulates and therefore the it can transfer heat a lot more faster.
I think the answer would b C