0. Luy 16. Why is soll called a renewable resource becouse 1 A. will not lest long C. can be recycled B. available for use anytime D. needs to be conserved 17. Which best desende humus is A. o mixture of decayed plants and animals B. a combination of any of the types of soil C. forms part of the loam soll D. toomast layer of the soll 18. Which of these variables refer to the this matchals or conditions that remain constant of me omen the experiment A. Manipulated variable C. Constant venosis B. Responding variable D. Experimenta 19. Which of these varables are varied or changed in the experimenta

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