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The Physical and Chemical Basis of Life
Cells and Tissues
54 other sections not shown
action potentials active adapted adult alleles amino acids animals annelids appendages arteries arthropods atoms axon behavior biological birds blood bone brain capillaries carbon cavity cells chemical chromosomes ciliated cnidocytes coelom composed contains contraction cord cycle cytoplasm digestive dorsal duct echinoderms eggs electrons embryo energy environment enzyme evolution evolved feeding female fertilization fibers FIGURE fish flatworms fluid freshwater frog function gametes gas exchange genes genetic gills glands glucose hormone human impulses increase insects intestine invertebrates larva layer living lungs male mammals mantle marine membrane mesoderm metabolism mitochondria molecules mollusks mouth muscle nerve nervous system neurons nucleus occur organs oxygen pair pharynx phylum planktonic plants population posterior primitive produced protein pseudocoelomates reactions receptor reproductive reptiles secreted segments shell skeleton skin species sperm structure surface synthesis temperature terrestrial tion tissue tube tubules types ventral vertebrates yolk