Sugars
Sunlight, 230. See also Light
Superbugs, 591
Suppressor T cells, 1019
Surface tension, 41
Survival of the fittest, 461–463
Survival strategies, 278
Suspension, 42
Sutton, Walter, 349
Symbiotic protists, 614–616
Symmetry, body, 738
Sympathetic nervous system, 908
Synapse, 900
Synovial cavity, 927
Synthetic genome, 435
Syphilis, 994
Systemic circulation, 950
Systolic pressure, 953
Taiga, 114
Taproot system, 669
Tar, 968
Taste buds, 910
TATA box, 379
Taxonomy, 510
Technology, 11
Teeth, 876
Telomerase, 352
Telomeres, 352
Temperate forests, 114
Temperate zones, 97
Temperature
Temporal isolation, 495
Temporal lobe, 903
Terracing, 160
Territorial behavior, 848
Tertiary Period, 563
Testosterone, 988–989
Tetanus, 587
Tetrad, 324
Tetrapoda, 518–519
Tetrapods, 760
Thalamus, 903
Theory, 13
Thermoreceptors, 909
Thigmotropism, 712
Thomas, Lewis, 64
Threshold, 899
Throat, 964
Thylakoid membranes, 236–237
Thyrotropin-releasing hormone (TRH), 987
Tiktaalik, 761
Tissues
Tissues, human, 862–863
Tissues, plant. See also Vascular tissue of plants
Tobacco mosaic disease, 574–575
Tolerance of species, 99
Topsoil, 158
Totipotent cells, 294
Toxins, 586
Trace elements, 671
Trace fossils, 752
Trachea epithelium, 215
Tracheophytes, 643–644
Traits, 309
Transcription factors, 379
Trans fats, 870
Transformation, bacterial, 339–340
Transgenic organisms, 426–430
Translation, 368–370
Transport
Tree of life, 23
Trees, 653
Trial-and-error learning, 843
Trichomes, 665
Trilobites, 540
Trisomy, 401
Trochophore, 756
Trophic levels, 77–78
Tropical zone, 97
Tropisms, 712
Tryptophan, 367
Tuatara, 762
Tuber, 702
Tubulins, 199
Tumors, 289
Tundra, 115
Turkish Angola, 416–417
Turner's syndrome, 401
Twins, 996
Two-factor cross, 317
Tympanum, 911
Type 1 diabetes, 1025
Typhoid, 400