Thyroid conditions may make getting pregnant impossible.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Excessive alcohol use costs the country approximately $235 billion every year.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
Overview of Cell Signaling
Embryonic Stem Cell
Plant Cell
Animal cell cytoskeleton
(a) The distribution of sickle cell anemia in the Old World. (b) The distribution of malaria overlap