When biologists studied photosynthesis, they used an isotope of oxygen called 18o. it will not harm the photosynthesis process but is used to track where the atoms go during the process. if the scientists used this radioactive oxygen in the carbon dioxide, in which molecule would the oxygen end up?

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.