Which best explains a primary reason for the inability of life to exist in Earth's early atmosphere? There was insufficient energy from material collisions to change their density.
O High temperatures during Precambrian time caused surface water evaporation.
O Volcanic eruptions and comet collisions added different gases to the atmosphere.
Available oxygen was used to help create an ozone layer within Earth's atmosphere.

Which statement describes why the us forest service is important a-it protects ecosystems, supervises public access of lands, and manages wilderness areas. b-it supervises public access of lands, manages wilderness areas, and enforces federal wildlife laws. c- it manages wilderness areas, enforces federal wildlife laws, and foreign governments with international conservation efforts. d- it enforces federal wildlife laws, foreign governments with international conservation efforts, and protects ecosystems.

5. what is a red giant? can our sun become a red giant? why or why not?

Which is an accurate description of the physical characteristics of poland? its fertile soil is found only along riverbanks, and its mountainous region in the northwest has few mineral resources. it is mostly flat with fertile soil except in the east and northeast, and the mountainous region in the south has large deposits of coal and copper. it is covered with thick forests, and it has large reserves of coal, petroleum, and natural gas. its landscape is dominated by plateaus, mountains, and high ridges, and it has large deposits of sulfur and copper in the northeast.