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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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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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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Approach used to determine the evolutionary relationships among many animal species using molecular Approach used to determine the evolutionary relationships among many animal species using molecular
The human birth process as an example of positive feedback. The human birth process as an example of positive feedback.
(a) Mammal species from central Saskatchewan differ greatly in their isotopic signatures. (b) There (a) Mammal species from central Saskatchewan differ greatly in their isotopic signatures. (b) There
Sites of mtDNA mutations in certain human diseases Sites of mtDNA mutations in certain human diseases
Some obesity genes in the human genome. The green triangles represent single genes in which obesity Some obesity genes in the human genome. The green triangles represent single genes in which obesity
Personality Profile Personality Profile
Video: Gas exchange - driving force

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