Which statements describe molecules? Check all that apply. Molecules are made of two or more atoms.
Molecules are all the same size
O Molecules range in size.
Molecules are only made of atoms of the same element.
Molecules are only made of atoms of different elements.
O Molecules are made of atoms of the same element or different elements.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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?