Eyelids in amphibians
Describe why the occurrence of eyelids in amphibians exist while they are absent in fishes in adaptation to terrestrial life?
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Eyelids are related to lacrimal glands which protect and keep eyes lubricated against harm from the huge luminosity of terrestrial environments. Fishes do not encompass eyelids as their eyes are in constant contact with the fluid material.
How do cells of the neoplastic tumors acquire nutrients and oxygen and release wastes?
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During the past 12 years, scientists have been exposing stands of aspen and birch to elevated levels of atmospheric O? at a facility (Aspen FACE) near Rhinelander, WI. The relative effects of O? exposure on stand growth has varied considerably am
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