Question

models can be helpful in scientific investigations because
a. they can be smaller and more manageable than the real thing
b. they can be safer to work with than the real thing
c. it may not be possible to work with the real thing
d. all of the above

Explanation:

In scientific investigations, models have multiple advantages. Option A: Models can be scaled down (e.g., a model of a planet - smaller and easier to handle than the real planet). Option B: Working with a model can be safer (e.g., a model of a volcano for study instead of the real, active volcano). Option C: Sometimes the real thing is impossible to work with (e.g., studying the interior of the Sun - we can't access the real Sun directly, so we use models). So all these reasons are valid for why models are helpful.

Answer:

D. all of the above