U

ulcers, 988

ultraviolet radiation (UV

radiation), 202-203, 202/; 203/; 289, 440 umbilical cord, 1048/; 1058/; 1059 ungulates, 872, 872/ unicellular organisms, 7, 510.

See also protists uniform distribution, 382, 383/ uniformitarianism, 298 units, SI, 23, 23t; 28-29,

1072-1073, 1072t; 1073t unsaturated fats, 59, 981 uracil, 205, 205/ urban ecology, 450, 450/; 452 urea, 786, 993-994 ureters, 846, 997, 997/ urethra, 997, 997/

urinary bladder, 791, 997, 997/ urinary system, human,

993-998, 994/; 995/; 996/; 997/. See also excretory systems URL, 20

uropods, 728/; 729 USDA Food Guide Pyramid, 979, 979/

uterine milk, 803 uterus, 1052, 1052/; 1053/

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