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These all develop through an embryo that is enclosed within a membrane called an amnion.

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The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water.Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.adaptive radiation: The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwin's finches).ammonoid: Extinct relatives of cephalopods (squid, octopi, and chambered nautiluses), these mollusks had coiled shells and are found in the fossil record of the Cretaceous period.amniotes: The group of reptiles, birds, and mammals.

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    Bullock recently surprised her fans when she performed the hip hop classic “Rapper’s Delight” on the set of The Jonathan Ross show.

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