The answer is (A). A is the only choice that shows an example of a diverse population.
I believe the answer is: positive externality
Positive externality refers to The benefit that enjoyed by a third party when the first and second party are conducting a transaction.
When you receive a vaccines, you prevent yourself from becoming a host that could contaminate other people from getting the virus. In the example above, you and your children are the first and second party. And other children are the third party.
Answer:
D. cultivate certain crops
Explanation:
In the Columbian Exchange, Europeans were exposed to new crops that they have never seen before. These included potatoes, corn, sugar, and more. Europeans would bring these new crops back to Europe and begin to use them to their advantage. Heck, potatoes single handedly saved the majority of the European population from starvation.
Answer: The Greeks won a decisive victory, losing only 192 men to the Persians' 6,400 (according to the historian Herodotus).