Describe two functions of catalyst in a chemical reaction

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

Which measure of an earthquake depends on how close you are to the focus?

2polnis which of the following is an advantage of an in vitro experiment?me