Carbon-14 is the radioisotope that is used to determine the age of once-living organisms. Radioactive dating is a technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material. The mostly used radioisotope is carbon-14, because may rocks and organisms contain this radioisotope.
<span>Chicks hatching from eggs is an innate behavior. Innate
behavioral adaptations are the result of millions of years of evolution. This
type of behavior is already "hard-wired" in the nervous system of
organisms and is usually inflexible. This is where a certain given stimulus triggers
the exact same response over particular organisms through time. The same adaptation
goes for other species that are naturally inclined to walk hours after their
birth, like giraffes and elephants do. It is in a way nature's natural
adaptation for species to survive through the course of time.</span>
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Bryophytes include mosses, liverworts, and hornworts.
