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Which of the following best describes why it is difficult to measure the effect of toxic...

Which of the following best describes why it is difficult to measure the effect of toxic substances on population health?

  1. Testing for toxic chemical exposure is not widely available.

  2. Negative health effects can occur many years after exposure.

  3. Toxic substance exposure always occurs along with other risk factors.

  4. The harmful effects of toxic substances are different in each individual

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Answer #1

Option B is correct because the

It is difficult to measure the effect of toxic substances on population health as negative health effects can occur many years after exposure. After the first exposure of the toxic substances it is hard to mesure its effects in the human population as till that early stage there is no any significant illeffects or disease. And at the chronic stage that are generally not easy to be manage.

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