Answer:
B is true .. atmosphere always changes day by day
A Punnet Square is what you're looking for :)
Answer:
carbon dioxide
Explanation:
It is a non-flammable gas that extinguishes fire by displacing oxygen. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
They can exchange both matter and energy, exchange energy but not matter, Isolated systems can exchange neither energy nor matter.
In a closed system only energy can be exchanged; matter stays inside.
In a open system matter and energy can be exchanged
