The ultimate source of continuous variations is

Options :
  1. natural selection
  2. sexual reproduction
  3. hormonal action
  4. mutations
Answer and Explanation :-

Answer: Option 2

Explanation:

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An almost perfect relationship with his father was the earthly root of all his wisdom. From his own father, he said, he first learned that Fatherhood must be at the core of the universe. [speaking of George MacDonald]
-C.S. Lewis Phantastes