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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Relationships between direction of flow of blood and water or air in different vertebrates.
The work of Charles Darwin forms the foundation for modern evolutionary theory.
Independent assortment of chromosomes at meiosis explains Mendel’s ratio
The Effect of Group Size on Relationships
Carbon Isotope ratio
Phylogenetic relationships among Hawaiian Drosophila species