A) stretch one side tighter B) stetch both sides the same C) only stretch one side
A) about 18-20 billion years B) about 4.5 billion years C) about 3.4 billion years D) about 6000 years
A) Micro - variations within kinds B) Macro - changing from one kind to another. C) Chemical - the origin of higher elements from hydrogen. D) Cosmic - origin of time, space, and matter.
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) away from the earth B) neither of these C) closer to the earth
A) staying the same B) slowing down C) speeding up
A) I don't know B) yes C) no
A) neither B) saltier C) less saltier |