I think the correct answer from the choices listed above is option A. Tolerance range is different for different organisms. <span>Animals can </span>tolerate<span> (or survive within) a certain </span>range<span> of a particular factor, but cannot survive if there is too much or too little of the factor. But this range depends on the organism. Hope this answers the question.</span>
People giving antibiotics to food animals are required to follow a "withdrawal time" after treatment. The withdrawal time is a waiting period after treatment that gives the animal time to reduce the concentration of the drug in its body, and therefore in the meat (or milk or eggs) the animal produces.
The 1819 Act was enacted to limit the number of hours children work in factories (12 hours and no night working) and the abolishion of employment of children less than 9 years old. This was necessitated by the negative impact of the factories' conditions on these children's long-term health, during a time when children were allowed to work.
