Answer and explanation

Correct answer: D. human height in a population

  1. Step 1: Continuous variation shows a smooth range of values with no distinct categories, and is usually influenced by many genes and the environment.
  2. Step 2: Height fits this; blood group and categorical traits do not.
Answer
human height in a population.
Why not the others: human blood group in a population: has distinct categories, so it is discontinuous. the presence or absence of a widow's peak: has two distinct categories. the number of petals as exactly 4 or 5 on a plant species: has distinct categories.

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