R

rabbits, 12, 12/, 870 radial canal, 765/, 766 radial cleavage, 665 radial symmetry, 655, 655/, 761 radicle, 620, 620/ radioactive decay, 283 radioactive isotopes, 283-284, 284/

radiolarians, 506/, 507 radiometric dating, 282-284,

284/ 284/, 303 radula, 706-707, 706/ random pairing, 318 raptors, 853-854 ratfishes, 779, 785 Ray, John, 340

ray-finned fishes, 779, 788. See also bony fishes rays, 779, 780/, 785, 785/ reabsorption, 996 reactants, 36 receptacle, 613, 613/ receptor proteins, 78/, 490, 490/,

962/, 970 receptors, 1016-1020, 1022, 1032 recessive traits, 177-178, 237 recombinant DNA, 258-259, 259/ recombination, 318, 471 rectal glands, 786 red algae, 511/, 512, 512/, 1081 red blood cells, 100, 100/, 905/,

940-941, 940/, 943, 943/ Redi, Francesco, 279-280, 279/ redox reactions, 37, 132 red tides, 513, 517, 517/ reflexes, 1014, 1014/ refractory period, 1008 regeneration, 675, 691, 767, 767/ regulator genes, 219, 219/ regulators, 364 regulatory proteins, 223 relative ages, 302 release-inhibiting hormones,

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