Studying embryonic vertebrate development in the frog is useful because the frog possesses all of the basic characteristics of nonamphibious vertebrates because the frog embryo develops externally this process can be easily observed the egg is large enough to be visible to the naked eye and develops quickly making . Development of frog embryonic development when sperm fertilize the egg streaming movements are set up in the egg and these results in distribution of materials so that three regions can be seen the upper animal hemisphere pole which is pigmented and lower white vegetal pole
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