Answer:
Because they happen naturally.
Explanation:
climate changes are natural to our planet and happen over time, according to the factors that act on the planet. In this way, climate changes should not be a concern for us, the problem is the speed with which they are happening.
Human activities use a lot of fossil fuels that stick to the atmosphere and accelerate these changes, which cause serious problems in the life of the planet.
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>
Answer: I HOPE IT HELPS
Sumer is the earliest known civilization in the historical region of southern Mesopotamia (now ... Sumerian written history reaches back to the 27th century BC and before, but the ... The center of Sumerian culture remained in southern Mesopotamia, even though rulers ... U.S. invasion · Iraqi insurgency · U.S. troop withdrawal.
Explanation:
