Answer:
European explorers brought animals, crops/food, and, most importantly, disease.
Step-by-step explanation:
The European exchange of animals, such as horses, allowed native Americans to study and understand different animals that can provide different resources. Crops from Europe allowed Native Americans to grow different crops and enable further sister farming, which was when three crops were grown in the same place. MOST IMPORTANT - SMALLPOX. This is perfect for building writing on this time. Over 90% of native Americans at this time were killed by smallpox, the measles, and the flu. Hope this helped.