Answer: my dear friend google.
Explanation: 2. Their settlements and social groups were impermanent, and communal leadership (what little there was) was informal. After European contact, some Great Basin groups got horses and formed equestrian hunting and raiding bands that were similar to the ones we associate with the Great Plains natives.
I am nice so I will give you the answer to two <3
Explanation: for number one open a tad input question and lookup. find an answer. ;)
hope this helps