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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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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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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Cellular section from the brain of a person who died from Alzheimer's disease. Cellular section from the brain of a person who died from Alzheimer's disease.
An example of color blindness test. A person with red-green color blindness would not be able to dis An example of color blindness test. A person with red-green color blindness would not be able to dis
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
Infants often rely on a caregiver as a secure base when they meet a new person. Infants often rely on a caregiver as a secure base when they meet a new person.
How Much Food Does the World Produce Per Person? How Much Food Does the World Produce Per Person?
(left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur (left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur
Video: Introduction to Heart Attacks

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