Chapter2

2.1 Atoms,Ions,and molecules All living things are based on atoms and their interactions [] no date needed

2.2 Properties of water waters unique properties allow life to exist on earth. [] no date needed

2.3 Carbon-Based Molecules Carbon-Based Molecules are the foundation of life. [] 11/19/11 4:22

2.4 Chemical Reactions life depends on it [] 11/19/11 4:22

2.5 Enzymes Are Catalysts for chemical reactions in living things.