What are reasons scientists use models?
to study objects far away.
to study objects too large.
to study objects too small.
to study objects easily found in a lab.
to study events that take place over long periods of time

To study objects far away.

To study objects too large.

To study objects too small.*

* - optional choice

i'm sure the answer you are looking for would be

a. an ice age

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what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?