Lead had been used in plumbing and other products since ancient times. how have chemists contributed to our understanding of lead today? a. they have shown how lead can build up and cause damage in the human body. b. they have described how the romans used lead in plumbing. c. they have defended lead as a useful material for many products. d. they have passed laws that prohibit the use of lead.

The answer is option A.

That is A: They have shown how lead can build up and cause damage in the human body.

Lead had been used in plumbing and other products since ancient times. chemists showed that  how lead can build up and cause damage in the human body.

Chemists have discovered lead toxicity and showed that it can cause damage in the human body since it is a toxic element.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.