process of metamorphosis in frog and butterfly
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The egg begins as a single cell. As the egg matures it eventually splits into two and those two eggs make four and so on (image). As the egg begins to form this mass of cells it turns into an embryo. It is during the embryo stage that the frog begins to develop its gills and organs while feeding off of the yolk that is inside of the egg. The yolk supplies the growing organism with nutrients up to 3 weeks.
After three weeks of the developmental period, the embryo leaves the egg and attatches onto a weed in the water. At this point the organism quickly develops into a tadpole. The tadpole stays attached to the weed until it is mature enough to swim free in the water. This stage takes from three days to three weeks depending on the type of frog they are going to mature into.
Once the tadpole is big enough to swim in the open water, it stays at the tadpole stage for about five weeks and then begins to change (image). Back legs begin to develop, shortly followed by front legs. The tails start to become noticably smaller and their lungs begin to develop so they are able to move around on land. While their lungs are deveolping underwater, they begin to come up from the water and breathe in air. After a few more days pass in this development stage the tadpoles begin to shed their skin and lips; their legs are also starting to grow and are able to start to function
The female butterfly lays her eggs in clumps of 10-100 on the back of a leaf that caterpillars may feed on. After about 5-10 days in the egg stage, the egg hatches into larva, which is like a tiny wrinkly worm. The larva or caterpillar eats many times its weight per day causing much damage to plantlife that surrounds it. The constant eating causes the caterpillar to grow rapidly and shed its skin constantly. After about three weeks the caterpillar turns into a pupa. In the pupa stage the caterpillar attaches itself upside down to a twig and has its last skin shedding period. After the caterpillar sheds its skin a flexible shell encloses its body. It is during this 2-3 week stage that the growing butterfly undergoes its major change. Inside the shell the larval structures are broken down and re-formed into what appears to be an adult butterfly.
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