Science and nature Sea urchins are amazing. Grasshoppers are amazing. biology of design Chuko Shinsho

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Science and Nature
Birds and insects are the animals that fly in the air. Birds have bones in their bodies, and they flap their wings by moving muscles supported by their bones. They need a lot of oxygen to fly their bodies, so the oxygen taken in by breathing through their lungs is put on their blood and spread throughout the body. Insects, on the other hand, have no bones in their bodies. Instead, they are covered with a hard skin of chitin, and they use a spring pendulum that combines muscles and cuticle to flap their wings quickly. Insects also need oxygen to fly, but they do not have lungs. How do they take oxygen into their bodies? Even animals that fly have very different body structures. This book takes up five groups of animals : cnidarian, arthropods, molluscs, echinoderms, and chordata. Each group has a different body structure and each group thrives.