In environmental health, the term toxin refers to a toxic substance that _______________. is naturally produced by a p

Question 1 

In environmental health, the term toxin refers to a toxic substance that _______________.

is naturally produced by a plant or animal

occurs in the occupational setting

results from human activity

a man-made product introduced into the environment due to human activity

Question 2 

In toxicity testing in rodents, the LD50 is a dose that is _______________.

acutely fatal to 50 percent of test animals

fatal to 50 percent of test animals within a 90-day period

fatal to 50 percent of test animals after lifetime bioaccumulation

Question 3 

Which of the following is not characteristic of a health impact assessment?

It evaluates a site or activity as it is, rather than looking forward in time

It includes social and economic factors in the assessment