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Mendel performed garden pea hybridization experiments between 1856 and 1863. During that time, he selected several specific pea traits. He performed cross-pollination/artificial pollination in true breeding pea plant lines that had stable trait inheritance and were self-pollinating continuously.

Mendel used a pea plant as a test subject and looked for seven distinct features in the plants. He then carried out tests to figure out how inheritance works. Through his two experiments, the monohybrid and dihybrid cross, Mendel formulated three laws of inheritance: the law of segregation, the law of independent assortment, and the law of dominance.

The Natural History is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the Natural History compiles information gleaned from other ancient authors

Rene Theophile Hyacinthe Laënnec (1781–1826) was a French physician who, in 1816, invented the stethoscope. Using this new instrument, he investigated the sounds made by the heart and lungs and determined that his diagnoses were supported by the observations made during autopsies.

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Three properties that are universal to all quadratic functions: 1) The graph of a quadratic function is always a parabola that either opens upward or downward (end behavior); 2) The domain of a quadratic function is all real numbers; and 3) The vertex is the lowest point when the parabola opens upwards; while the vertex is the highest point when the parabola opens downward.

Manatees are large, fully aquatic, mostly herbivorous marine mammals sometimes known as sea cows. There are three accepted living species of Trichechidae, representing three of the four living species in the order Sirenia: the Amazonian manatee, the West Indian manatee, and the West African manatee