13. Trees provide us with oxygen. What benefit can we get from planting trees?
a. provides food
b. source of income
c. for decorative purposes
d. All of the above
14. Good plant materials come from trees that are
a. young
b. small
C. old
d. mature
15. If we can use the trunk and branches for our houses and furniture, what benefit does it give?
a. provides food
b. for building purpose
c. for decorative purposes
d. provide us with air
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Answer:
13. d. all of the above
14. d. mature
15. b. for building purpose