昆虫两栖动物鸟类的生殖和发育方式以及对环境的适应性?

2025-03-30 03:29:18
推荐回答(1个)
回答1:

两栖类作为水生向陆生的中间态生物。保留了水生动物的许多生殖方式。因为两栖类的水陆性 生殖方式仍采取体外受精 受精卵自然水环境发育 但是在发育上又有了独特之处-变态 水生的幼体如蝌蚪保留了许多低等动物的特征 如腮 游泳尾 侧线等 但是变态后成体有了适应陆生的许多特点 如第一次出现了 五趾型的四肢 肺呼吸 可以短时间离开水生活 蟾蜍等能长期离开水生活。 两栖类的低等类型如蝾螈则不存在此变态 鸟类是羊膜卵恒温陆生动物 由于陆生条件 不同于两栖动物自然水环境发育 鸟类的胚胎浸润在羊水中发育 也因为陆生原因 鸟类都是体内受精。 但大部分鸟类没有交配器 只是生殖口的对接交配。 鸟类在发育上除了羊膜卵发育 在破壳后也有不同 像鸡鸭等 雏鸟出生有毛 可以走动的成为早成鸟 像燕子等出生后眼镜不睁开 无毛的 靠亲鸟哺育长大的叫后成鸟 还有 鸟类的生殖系统应该有雌性右生殖腺萎缩现象 这是我考记忆答的 不满意见谅了
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