a. Sir Isaac Newton wanted to invent an air conditioner for birds. He constructed a fanlike device and pointed it at the apple tree where his favorite birds perched. The fan converted the energy of the apples in the tree into energy, and they fell on Newton's head. And now we have a theory of gravity.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

the answer is c.the valence of the atoms combine .