The marine ecosystem is the largest ecosystems on earth basically the oceans ecosystems
A flagellum, is a structure in single celled organisms that pave the way for movement. In sperm cells for example, they can transport themselves so quickly due to the rapid movement of the flagellum.
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As evidenced by their most recent common ancestor, the wings of the butterfly and the wings of the bat evolved independently, long after their ancestral lineages diverged. More examples of analogous structures: wings of various species (though the bones supporting the wing may be homologous, in some cases)
