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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Evolutionary change in the tetrapod lineage, showing a transitional form. Evolutionary change in the tetrapod lineage, showing a transitional form.
The heavily worn, and sometimes cutmarked, anterior teeth of Neadertals suggest that these teeth wer The heavily worn, and sometimes cutmarked, anterior teeth of Neadertals suggest that these teeth wer
Deciduous and permanent teeth: (A) deciduous teeth, with the age at eruption given in months; (B) ... Deciduous and permanent teeth: (A) deciduous teeth, with the age at eruption given in months; (B) ...
Erosion of palatal surfaces of maxillary teeth due to chronic vomiting. Erosion of palatal surfaces of maxillary teeth due to chronic vomiting.
Typical sequence of tooth eruption for both deciduous and permanent teeth Typical sequence of tooth eruption for both deciduous and permanent teeth
Rodent Teeth Rodent Teeth
Video: Lipid catabolism ( ketogenesis and oxidation of glycerol) and Lipid anabolism (lipogenesis)

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