This medium worksheet pushes first graders deeper into how animals breathe, eat, and change as they grow. Part A has nine fill-in-the-blank sentences covering a frog laying eggs in water, a tadpole breathing with gills while an adult frog uses lungs, a caterpillar eating lots of leaves, a butterfly emerging from the chrysalis, and a chick using its beak to break the shell before becoming a hen.

Part B is a four-pair matching task connecting butterfly, frog, chicken, and caterpillar to chrysalis, tadpole, nest, and leaf. The combination introduces stage-specific body parts like gills and lungs while reinforcing the habitats and foods that go with each animal's cycle.