What was the original volume of gas if heating it from 22k to 85K produced a volume of 3.8 liters.

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.

b. examine and describe cells

that tool would be a compass

i think its 100.

hope this !