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.
Volcanic eruptions and comet collisions added different gases to the atmosphere
O Available oxygen was used to help create an ozone layer within Earth's atmosphere.

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

Ais a group of individuals of the same that exist together in the same place at the same time

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geological equipment to analyze the composition of rock?