Each annual ring consists of two strips of

Options :
  1. sap wood and heart wood
  2. porous wood and non porous wood
  3. autumn wood and spring wood
  4. soft wood and hard wood
Answer and Explanation :-

Answer: Option 3

Explanation:

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I didn't fully realize it at the time, but the goal of my life was profoundly molded by this experience- to help produce, in the next generation, more Mother Teresas and less Hitlers.
-Elizabeth Kubler-Ross