Answer:
Because there is no gravity in space and if you pour water from a watering can it would just float around and never get to the roots.
A few example are
carbon/uranium dating
genetic variations
similar bone structure among vastly different species. For example: the great blue whale was 2 hip bones and 2 femurs!
Answer:
I believe it would be the muscular system
Explanation:
The digestive excretes the not needed food in your body, (I won't go into detail) The respiratory excretes Carbon dioxide which would be a form of waste.
The different blood vessels; First, Arteries that carry the blood from the heart. Then, the Capillaries which allow an exchange of water and chemicals throughout the blood and the tissues. Finally, Veins that carry blood from the capillaries to the heart.
