Saturday, August 07, 2004

Amphibian, Embryonic stage

Within the egg a series of semipermeable gelatinous capsules enclose the embryo suspended in fluid surrounding the yolk (perivitelline fluid). These capsules can be eventually digested by hatching enzymes that are produced by frontal glands on the snouts of embryos. All nutrients necessary for egg development within the ovary are supplied by the yolk in the


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