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Studies on theropod dinosaurs do suggest multiple (at least 3) independent acquisitions of powered flight however, [1] [2] and a recent study proposes independent acquisitions amidst the different bat clades as well. [3] Powered flight uses muscles to generate aerodynamic force, which allows the animal to produce lift and thrust. The animal may ...
Advanced Placement (AP) Biology (also known as AP Bio) is an Advanced Placement biology course and exam offered by the College Board in the United States. For the 2012–2013 school year, the College Board unveiled a new curriculum with a greater focus on "scientific practices".
A direct flight in the aviation industry is any flight between two points by an airline with no change in flight numbers, which may include one or more stops at an intermediate point(s). [1] A stop may either be to get new passengers (or allow some to disembark) or a technical stop over (i.e., for refuelling).
The frequency range in insects with synchronous flight muscles typically is 5 to 200 hertz (Hz). In those with asynchronous flight muscles, wing beat frequency may exceed 1000 Hz. When the insect is hovering, the two strokes take the same amount of time. A slower downstroke, however, provides thrust. [8] [9]
Greg Chin, Miami-Dade Aviation Department communications director, shared that the connection does depend on the airlines and if the flight is international or domestic. "At least two hours is a ...
The collective goal is to contribute excellent biology diagrams to the Commons and to corresponding Wikipedia articles. This is done as part of an Advanced Placement Biology course. The lead editor is Chris Packard. This project is inspired by the 2009 Wikipedia AP Biology Project. There are many basic and important diagrams missing from ...
United Airlines planes lined up at their jet bridges at Denver International Airport in March 2014. A jet bridge (also termed jetway, [1] jetwalk, airgate, jetty, gangway, planeplank, aerobridge/airbridge, finger, skybridge, airtube, expedited suspended passenger entry system (E-SPES), or its official industry name passenger boarding bridge (PBB)) is an enclosed connector which most commonly ...
Hummingbirds and sunbirds, two nectarivorous bird lineages in the New and Old Worlds have parallelly evolved a suite of specialized behavioral and anatomical traits. These traits (bill shape, digestive enzymes, and flight) allow the birds to optimally fit the flower-feeding-and-pollination ecological niche they occupy, which is shaped by the birds' suites of parallel traits.