What is true about earth's atmosphere? a) it has always had the same composition. b) it has and always will continue to change. c) it has not changed in the past will change in the future. d) it has changed in the past but will not change in the future.

Look at the illustration of four letters from the american manual alphabet. decide whether the description of the letter is a good definition. if not, choose a counterexample. the letter i is formed by sticking up the smallest finger and folding all the other fingers into the palm of your hand with the thumb folded over them while keeping your hand still.