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This Concept Map, created with IHMC CmapTools, has information related to: group 4 arb new, 1. Fertilized Eggs . The mass of cells in the egg come to form an embryo. Organs and gills begin to form, and in the meantime, the embryo lives off of its internal yolk. This supplies it with nutrients for 21 days. 2. Legless Tadpole, 4. Froglet The tadpole becomes a froglet; it has 4 legs, breathes with lungs, and loses its tail. 5. Adult Frog, 2. Legless Tadpole This stage hatches from the egg. The tadpole spends its time swimming in the water, eating and growing. Tadpoles breathe using gills and have a tail. 3. Hind Legs Develop, 3. Hind Legs Develop In this stage the tadpole sprouts legs (and then has a longer body, and has a more distinct head. It still breathes using gills and has a tail. 4. Froglet