Answer:
The answer is carrying capacity
One group of reptiles, characterized by the fossil Archaeopteryx, led to the evolution of birds. The correct answer is birds
The habitat is the kind of natural environment in which a particular organism species lives and it's ability to reproduce determines its niche.
(Prime Example):
Elephants shape their environment in many ways. They can change a forest to a grassy field or dig a hole that might become a pond.
I believe the answer your looking for is they hang upside down all the time this is one of their survival skills! Hope this helps!
Fermentation and anaerobic respiration