Assuming the carbon cycle is a closed system, which of the following statements is true? 1. When all the fossil fuels are used up, there will be no more carbon.

2. Mass and energy are conserved in the carbon cycle.

3. The Sun absorbs energy from the carbon cycle.

4. As population sizes increase, more carbon is produced.

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.