如题, 老师好像有说过是人类 ---++ (以下是我翻笔记看到的, 不知道有没有抄错..第8题有找一些资料) 2. 为甚麽鱼跃龙门是大鱼而不是小鱼? 因为大鱼的metabolic rate较高, 耗氧量较高, 比小鱼较不耐缺氧, 所以水中缺氧时, 大鱼先跳出水面, (希望跳至含氧较高的水中。) 7. 鳗鱼需要溯河回到生长地, 此时河川正受到污染, 鳗鱼会如何? 可能会爬上岸... 8. 为甚麽很多生物都选在夜晚孵化? Dispersal is an important feature in the life history of almost all organisms. Clearly everything from juvenile fish to juvenile trees cannot simply pile up at the location of their parents. All young must disperse and find their own piece of habitat and avoid competing with its parents. Through natural selection, many organisms tailor the dispersal stage and other stages of their early life history to suit them and their environments. -- 　　　　　　　　蜗牛牵我散步 　　　　　　我看见牵牛花 　 --

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