I'll say the answer is D, or 4, since the Aztecs did expand over the warm tropical lowlands and the cool tropical highlands which would allow them to have more options in terms of which kinds of crops could be grown.
What chapter is this question about?
Which vaccines? Vaccines in general should be required because the advantages outweigh the negative results. If no one was vaccinated we’d have a plague. A vaccine is introducing what we’re trying to eliminate to your immune system in order to gain the antibodies to fight it off
Answer:
If you mean like or as in the second sentence I would move than to like
2. It is useless to repair that old door.
3.The heavy rain prevented us from having the picnic.