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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

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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.

A comparison of alloploidy (seen in species hybrids) and new allopolyploid species. A comparison of alloploidy (seen in species hybrids) and new allopolyploid species.
Invasive species provide an example of predator pressure. Invasive species provide an example of predator pressure.
These species are all at risk of extinction. Species with slow life-h These species are all at risk of extinction. Species with slow life-h
Invasive species and the biodiversity loss Invasive species and the biodiversity loss
The human metallothionein IIA gene promoter The human metallothionein IIA gene promoter
Human urinary system Human urinary system
Video: Role of the respiratory system - effect of altered ventilation rates

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