Plants have these because root nodules<span> are formed when nitrogen fixing bacteria called "rhizobia" start to enter the cells of a host </span>plant<span>. Rhizobia normally live inside of the soil and they </span>can<span> exist without a host </span>plant<span>.</span>
260 million years ago there was a supercontinet called Pangaea
Sorry I'm just trying to get points
Answer:
c. fewer than 6 people per square kilometer
Explanation:
The overall population density of the Amazon Basin IS fewer than 6 people per square kilometer.
