When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of ca3(po4)2?

May someone me with these science questions

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.