Question

You have been chosen to colonize a new planet. You discover the planet has everything Earth has, except Moon. What can go wrong?

Answer 1

Life there won't be like it's here. Since the moon and sun are deeply rooted in our very own system, absence of anything will effect our mechanism in a serious way.

Our breath , heartbeat , energy upserge , water level , periods in girls, and every other fundamental mechanism will undergo serious change. This might not be suitable for several million year but species will adapt and who knows if humans will remain the most intelligent species there?

It might have an unstable core which can make the planet alter it's rotation and motion coz of its core shift.