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Author Question: Proteins that travel to target cells to direct an activity are called A) messengers. B) enzymes. ... (Read 78 times) |
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Thyroid conditions may make getting pregnant impossible.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.