Question

question 1 of 10
how have safety concerns about chemicals changed over time?
a. government officials rather than scientists decide what chemicals are dangerous.
b. as scientists have learned more about chemicals, they have become more aware of their dangers.
c. all nations have agreed to a set of safety standards, so testing chemicals is no longer necessary.
d. scientists are no longer as concerned about chemicals because they are much safer today.

Explanation:

As scientific knowledge about chemicals has advanced over time, scientists have discovered more about their potential hazards, increasing awareness of dangers. Option A is incorrect as scientists play a major role in determining chemical dangers. Option C is wrong because testing chemicals is still crucial despite safety - standards. Option D is false since concerns about chemicals persist.

Answer:

B. As scientists have learned more about chemicals, they have become more aware of their dangers.