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The present giraffe has a long neck as compared to its ancestors. Lamarck believed it could be due to
  1. Continuity of germplasm
  2. Inheritance of acquired characteristics
  3. Natural selection
  4. Descent with change


Solution

The correct option is B Inheritance of acquired characteristics
Lamarck's theory of evolution is also known as the theory of inheritance of acquired characteristics . The theory states that, only the useful characters which an individual gains during their life time, are passed on to the next generation.
He explained this theory using the example of giraffes, which were originally short-necked animals, but through continuous attempts to reach out to higher trees for leaves to eat, kept exerting pressure on their necks. Over generations, the length of the neck kept increasing, eventually resulting in the present day long-necked giraffes.

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