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allele amino acids animals archaea bacteria behavior biomes birds blood cells blood vessels body bones brain called cancer carbon dioxide cardiovascular system cause CC-BY CC-BY-SA cellular respiration Check Your Understanding chemical chromosomes common cycle Darwin develop digestive system disease drug Earth echinoderms ecosystem eggs energy environment enzymes eukaryotic evolution example factors female fish flowers fossil frogs function fungi Further Reading gametes gene genetic glands GNU-FDL habitat heart homeostasis hormones human immune system insects kidneys Lesson Objectives Lesson Summary living lungs lymph mammals meiosis membrane microscope mitosis molecules muscle MyPyramid natural selection nerve nervous system neurons nutrients occurs organisms oxygen pathogens photosynthesis phylum plants Points to Consider pollution population predators produce prokaryotic protein protists Public Domain respiratory system Review Questions scientists shown in Figure skin species sperm structure Supplemental Links tissue traits vertebrates white blood cells