If heating up a homogeneous mixture, which combination of equipment is most
appropriate?
a. Evaporating dish and clay triangle
b. Iron ring and condenser
c. Crucible and wire gauze
d. Wire gauze and evaporating dish

b. Iron ring and condenser i think

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.