【實用教育app】Metamorphosis of a Frog|最夯免費app

Frog is an amphibian that belongs to a group called vertebrata.Frogspawn is a mass of fertilised eggs surrounded by a protective nutrient jelly. Egg divides and redivides to give rise to the embryo. It clings to the water weed.Tadpole is a larval stage in the life cycle of a frog. Its long, vertically-flattened tail helps it to swim, and because it has gills, it is able to respire in the water.After about 6 to 9 weeks, little tiny legs start to sprout.

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