Which of the following are solutions? Choose more than one if needed

1. Gas dissolved in a liquid

2. Liquid dissolved in a liquid

3. Solid mixed with solid

4. Solid dissolved in a liquid

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.

window cleaner is ammonia dissolved in water. this is an example of a