I just need a bit of help on this!

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2. In what area of medicine did the Incas make the most notable advances?
<Surgical preparation>
Antibiotic Medicine
Splinting of broken bones
Organ transplants
3. How did empire-building benefit farm production?
by reducing population pressure
<by providing more labor resources>
by expanding trade alliances
by making available fertile, flat lands

2 answers

You'll need to depend on your text or Google for #2.

I disagree with you on #3, but it's best to double-check your text for this one, too.
Writeacher, us students come here for help. Can you at least TRY to help us instead of sending us somewhere else?