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