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Author Question: A(n) ________________ is the stimulus that is present when a behavior is reinforced. Fill in the ... (Read 23 times) |
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.
Asthma cases in Americans are about 75% higher today than they were in 1980.