A) stetch both sides the same B) stretch one side tighter C) only stretch one side
A) about 4.5 billion years B) about 6000 years C) about 3.4 billion years D) about 18-20 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 the trillionth the diameter of a protron B) nothing C) a mass a few light years in diameter
A) increase B) loose
A) away from the earth B) neither of these C) closer to the earth
A) speeding up B) staying the same C) slowing down
A) no B) yes C) I don't know
A) saltier B) neither C) less saltier |