2. A plant absorbs sunlight, which is used for photosynthesis.

3. Energy obtained from food molecules would be reduced.

4. Artificial

5. Plants or Producers

6. Cell membrane and cell wall

7. Homeostasis

8. Increasing the surface area of a reactant. (GRIND IT) Stirring the reaction mixture (STIR IT) Adding a catalyst to the reaction mixture Increasing the temperature at which the reaction takes place. (HEAT IT)

9. The use of ethanol reduces the amount of greenhouse gases produced from fossil fuels.

10. The type of element (ionic or covalent) and the number of valance electrons that atom has.

13. HYDROGEN

14. Her mass will remain the same.

18. FRICTION

19. ELECTRONS

21. Any change in state of matter is a physical change.

23. A baseball flying through the air.

24. A skier at the top of a hill.

26. TT tt RR rr

27. GGATCGA A to T T to A C to G G to C