Answer:
The Main characteristic is the ability to grow their own food
Explanation:
Other characteristics include, less reliance on hunter-gatherer life, more permeant or semi permeant settlements or sedentary settlements and birth of agriculture as a lifestyle.
I believe the answer is: serve at homeless shelters.
The help that given through a community service tend to target small/local area.
Service through army is for a nationwide area, so option A is wrong.
Signing up for peace corp is affecting world wide area, so option B is wrong.
Take part in teach America is a form of service with nation wide influence, so option D is wrong.
That leave us with serving at homeless shelters.
