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Hace 17 horas · Description Size of Mellisuga helenae (bee hummingbird) – the world's smallest bird – compared to a human hand Adult male bee hummingbird, Cuba. Hummingbirds are the smallest known and smallest living avian theropod dinosaurs. The iridescent colors and highly specialized feathers of many species (mainly in males) give some hummingbirds exotic common names, such as sun gem, fairy, woodstar ...
Hace 17 horas · Explain the physiological splitting of the 2nd heart sound. Inspiration -> Lower intrathoracic pressure (more -ve) -> Venous return increase -> Stroke volume increase -> Contraction and ejection time increase -> Pulmonary valve closes later than usual. What causes the 3rd heart sound?
Hace 17 horas · Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States.With a population of 2,746,388, as of the 2020 census, it is the third-most populous city in the United States after New York City and Los Angeles.As the seat of Cook County, the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially ...
