The correct answer should be c. american indian slaves did the work on large-scale farms.
Spanish conquistadors were ruthless towards the natives and often enslaved and exploited them for personal gain.
Answer:Phase change materials (PCM) are substances that absorb and release thermal energy during the process of melting and freezing
Explanation: when it cools it changes like ice melting
So that they can use them as primary sources to find out the most accurate facts