Some one help . 10 points

Explanation:

I think that the answer is A

D) is the answer

Explanation:

The 3 rules

1). It can be separated by physical methods.

2. It can appear different from different sources.

3. It cannot be described by a chemical symbol or formula. Mixture is composed of at least two substances.

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.

no podemos ver la

explanation:

no te podemos ayudar: /