Materials that allow water to pass through them easily are
a. permeable.
b. impermeable.
c. saturated.
d. unsaturated

permeable

Explanation:

Permeable: Materials which allow water to pass through them. Example: Sand

Impermeable: Materials which do not allow water to pass through them. Example: Clay

Saturated: Solutions in which no more solute can be added to the solution at that particular temperature. Example: When sugar can be seen in the water

Unsaturated: Solutions which contain less than the maximum amount of solute that can be present at that temperature. Example: When sugar completely dissolves in water.

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

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.