Review the responses below; then SELECT ALL the reasons why we use scientific models.

Question

a
Models are used when systems are too expensive, expansive or impossible to use.
b
Models help you understand complex systems.
c
Models allow exploring very small or very large systems.
d
Models are always expensive.

Answer 1

The reasons why we use scientific models are:

a) Models are used when systems are too expensive, expansive or impossible to use.
b) Models help you understand complex systems.
c) Models allow exploring very small or very large systems.

d) Models are always expensive is not a reason for using scientific models; in fact, it is generally not true that models are always expensive.