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 are always expensive.
c
Models allow exploring very small or very large systems.
d
Models help you understand complex systems.

Answer 1

The correct reasons for using scientific models are:

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

Reason b ("Models are always expensive") is incorrect as it suggests a universal characteristic that does not apply to all models.