Read the question and encircle the letter the best answer. 1. A change in an object's position is called
a. Force b. molion c. pulling d. pushing​

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.