What is believed to have caused people to first move out of africa? where did they go?

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old