A) stretch one side tighter B) stetch both sides the same C) only stretch one side
A) about 6000 years B) about 3.4 billion years C) about 4.5 billion years D) about 18-20 billion years
A) Micro - variations within kinds B) Macro - changing from one kind to another. C) Cosmic - origin of time, space, and matter. D) Chemical - the origin of higher elements from hydrogen.
A) a mass a few light years in diameter B) a mass the trillionth the diameter of a protron C) nothing
A) loose B) increase
A) neither of these B) away from the earth C) closer to the earth
A) staying the same B) slowing down C) speeding up
A) no B) I don't know C) yes
A) neither B) saltier C) less saltier |