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Devolution, de-evolution, or backward evolution (not to be confused with dysgenics) is the notion that species can revert to supposedly more primitive forms over time. The concept relates to the idea that evolution has a divine purpose and is thus progressive (orthogenesis), for example that feet might be better than hooves, or lungs than gills.
Contingency was especially emphasized by Stephen Jay Gould, particularly in his 1989 book Wonderful Life. [ 1 ] [ 2 ] Gould used the thought experiment of rewinding the "tape of life" to the distant past, and argued that even small changes to history would result in evolutionary outcomes very different from our world.
Some things, especially breakups, are hard to let go of. Here are 10 ways to move past the trauma and get on with your life. ... “Letting go isn’t easy or straight-forward,” Dr. Jacowitz ...
In cell biology, a biological pathway is a series of interactions among molecules in a cell that leads to a certain product or a change in the cell. Such a pathway can trigger the assembly of new molecules, such as a fat or protein. Pathways can also turn genes on and off, or spur a cell to move. [1]
In the 1928 book The Nature of the Physical World, which helped to popularize the concept, Eddington stated: . Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past.
12. “It’s hard to be clear about who you are when you are carrying around a bunch of baggage from the past.” - Angelina Jolie 13. “We would do ourselves a tremendous favor by letting go of ...
is used in aquatic and aerial systems to measure the flow of fluid around and past a moving aquatic organism, allowing fluid dynamics calculations to determine pressure gradients, speeds, etc. Fluoroscopy allows real-time X-ray video, for precise kinematics of moving bones. Markers opaque to X-rays can allow simultaneous tracking of muscle length.
Charles Darwin. The idea that the function of a trait might shift during its evolutionary history originated with Charles Darwin (Darwin 1859).For many years the phenomenon was labeled "preadaptation", but since this term suggests teleology in biology, appearing to conflict with natural selection, it has been replaced by the term "exaptation".