Which of the following ions came from an atom that gained 2 electrons? a. 0^2- b. li+ c. mg^3+ d. n^3-

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)