摘要

<正>青蛙是一种两栖动物,它们的幼体与成体差别很大,会在短时间内完成形态的改变。请你了解它们的变化过程,并将空格补充完整。Stage 1:Egg The life cycle of a frog beginsas an egg. An adult frog will layeggs in calm w 1. A frog can难易度lay about 400 eggs at one time in the water.