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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

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There are more bacteria in your mouth than there are people in the world.

Multiple crossovers can include more than two chromatids Multiple crossovers can include more than two chromatids
Multiple Immunoglobulins Multiple Immunoglobulins
Withdrawing Medication from Single-Dose or Multiple-Dose Vials Withdrawing Medication from Single-Dose or Multiple-Dose Vials
Select Signs and Symptoms of Feeding and Eating Disorders Select Signs and Symptoms of Feeding and Eating Disorders
A late stage in mitosis after the chromosomes (stained blue) have separated A late stage in mitosis after the chromosomes (stained blue) have separated
How does PCA reduce the dimension of a statistical problem? How do you select the reduced ... How does PCA reduce the dimension of a statistical problem? How do you select the reduced ...
Video: Covalent bonds - role in the body

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