Fill in: free, sea, breathing, animal, large, life.
1. Antarctica is home to ........ life dependent on the sea, such as the Emperor Penguin.
2. Scientists have not identified all the different ................. forms on Earth yet.
3. ................... radicals are molecules responsible for aging and tissue damage.
4. The ...................... system of fish differs from other animals; fish have gills, while mammals have lungs.
5. Our lungs would collapse if we inhaled ......... doses of oxygen.
6. You can find ..... algae floating on many large bodies of water.

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