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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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People about to have surgery must tell their health care providers about all supplements they take.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

Difficulties in applying the morphological species concept Difficulties in applying the morphological species concept
The Dugong is an endangered species; the largest remaining population is found in Australian waters The Dugong is an endangered species; the largest remaining population is found in Australian waters
The Red-bearded Bee-eater Nyctyornis amictus is a large species of bee-eater found in the Indo-Malay The Red-bearded Bee-eater Nyctyornis amictus is a large species of bee-eater found in the Indo-Malay
Human Heart Human Heart
Taste receptors in the human tongue Taste receptors in the human tongue
Producing human insulin in E. coli Producing human insulin in E. coli
Video: Bond in biological molecules (Ionic, Covalent and Hydrogen bonds)/ How atoms bond?

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