can someone tell me if these are right?

Which concept did the maya understand the europeans did?
A. Architecture
B. calendars
C. hieroglyphics
D. the number zero (My answer)
Which of the following best explains how the Mayans adapted their environment
A. The mayans developed a nomadic lifestyle to hunt for food (my answer)
B. The mayans fertilised their fields so they could be used every year.
C. They traded with others due to their lack of good land or farming
D. They specialized in fishing due to the abundance of rivers.
What did the Maya adopt from the Olmec?
A. Calendar
B. Slash and burn agriculture
C. pyramids
D writing system (my answer)

sadly they were not but thanks lol

Yes, all of your answers are correct.