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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.