Pls help with all the questions ill mark u brainlist

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen

Which of the following types of reactions would decrease the entropy within a cell? a. dehydration reaction, b. hydrolysis, c. respiration, d. digestion, e. catabolism.