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In most ecosystems, sunlight provides the ultimate source of energy to power all biological activity
Otitis media. This illustration shows an inflamed tympanic cavity, which is the most common source o
Achondroplasia. The individual in this photograph has the reduced limb development that typifies thi
Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore
Crying Frequency in the Early Months In their first months of life, infants often cry for no appare
Physical distance versus recombination distance on human male and female chromosome 19