ACROSS

1. This is the science of heredity and variation in living things.

4. This is the study of celestial objects such as stars, planets, comets and galaxies.

5. This is the study of forces that affect Earth such as the weather, earthquakes and gravity.

6. This is the study of chemical processes in living things.

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2. This is the study of living things, and their enviroment.

3. This is the study of the mechanical and physical functions of living forms.