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