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Two important measures of a population are population size, the number of individuals, and population density, the number of individuals per unit area or volume. Ecologists estimate the size and density of populations using quadrats and the mark-recapture method.
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Una condición podría deberse al clima, los impuestos o los vecinos. Espero que esto haya ayudado.
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The radioactive isotope content of a rock can be used to identify the rocks age.
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This salinity versus depth profile is typical of the South Atlantic ocean. ... In this profile, salinity at the surface is high (evaporation at this latitude is high) and then salinity decreases until a depth of about 1,000 meters. Salinity then increases again slightly with increasing depth. The ocean around Antarctica has a low salinity of just below 34ppt, and around the Arctic it is down to 30ppt in places.
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The answer is mold.
A mold fossil is formed when sediment harden around the buried remains of an organism.
