Answer:
Vein
Explanation:
Veins are the ones that keep you alive because blood goes inside the vein
It is both biotic and abiotic
Answer:
A question is never clear
They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out
Ecosystems disturbed by a nature will be eventually restored unless it's a really big cataclysm, but most of the ecosystems are now a human caused disturbance. For example there are plenty of species which are already extinct or nearly extinct because of hunting industry.
