please tell me the chemical formula of 1.calcium oxide 2.potassium oxide using the crossover method PLEASE KEEP IT SHORT THANKS FOR HELPING

Why is soap used to remove grease? a. its nonpolar end dissolves the grease. b. it makes the water bond with the grease. c. it chemically bonds with the grease. d. its polar end dissolves the grease.correct answer for apex - a, its nonpolar end dissolves the grease.

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

The fact that the total amount of energy in a system remains constant is a(n)