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able acid activities algae amino acids animals appear atoms bacteriophage base become begins behavior birds blood body bonds called carbon carried cells changes Chapter characteristic chemical chromosomes close combination common complex consists contains continue course cycle cytoplasm depending digestive divide division electrons embryo energy entire enzymes example experiments female Figure flower fluids four function gametophyte gene genetic glucose grow growth higher hormone human hydrogen important increase insects known layer leaves light living male material means membrane molecules move muscle nature nerve normal nucleus occur organisms outer oxygen pair pass plants possible produced protein reaction released result root seen separate serve sexual reproduction shell shown shows single species spores stage structure studies substances sugar surface takes tion tissue tube turn types usually vertebrates wall