Me answer both write 6 sentence max youuu

Scientest have proven that, because of climate change, the earth's ground and area has changed. The atmosphere has changed because people built different mechines that pollute the air. Trees and valleys are being replaced with cities, towns, buildings, and other structures. Trees are being chopped down for more materials, and that affects the air we breath, because air comes from trees. Our water supply increases and decreses depending on the natural disasters that occur over the years.

a. it led to stricter immigration laws.

question

which are human systems?

the amazon rain forest

the appalachian trail

the george washington bridge

the himalayas

the hoover dam

the north american free trade agreement