【问题】 1. A frog zygote & frog blastula are nearly the same size. Explain this observation. And predict what would happen if you transplanted tissue from the organizer region (above the dorsal lip) of a late-stage frog gastrula to its ventral side. 2.Idemtify a major functional consequence of the countercurrent-like characteristics of the loop of Henle. What do the number & length of nephrons indicate about the habitat of fishes: what do they indicate about rates of urine production? 可以帮我解答这两题吗？谢谢。 --

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