If the plane of the Earth's equator were not tilted with respect ...

[TVarnum]

If the plane of the Earth's equator were not tilted with respect to the ecliptic plane,
 
  a. the daylight period of Earth would be the same year-round.
  b. there would be no seasonal changes.
  c. Earth's poles would not experience six-month-long nights.
  d. All of the above.

Question 2

Assume you lived on the Moon and noticed the Earth high in the sky. From that location, how often would the Earth set below your horizon?
 
  a. every 24 hours
  b. once a sidereal period (27.3 days)
  c. once a synodic period (29.5 days)
  d. every year
  e. never

[peilian]

Answer to Question 1

d

Answer to Question 2

e

[TVarnum]

Thank you!

[peilian]

Always glad to help...