An energy resource that can be replaced by nature in a relatively short time is known as a "<span>inexhaustible energy resource" but these are very rare in nature. </span>
Cellular<span> differentiation is the process by which a less specialized </span>cell<span> becomes a more specialized </span>cell<span> type. Differentiation occurs numerous times during the development of a </span>multicellular organism<span> as the </span>organism<span> changes from a simple zygote to a complex system of tissues and </span>cell<span> types.
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B) Geologic.
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~{Isle of flightless birds}
