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