Why is it difficult to estimate chemical toxicity in real life using laboratory experiments?
What will be an ideal response?
Estimating toxicity in real life using laboratory experiments is difficult because toxins are never really isolated in the environment. Each day we all are exposed to a number of substances that may decrease or enhance toxic effects.
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When Suzie touches a hot penny in the sunlight with her finger, energy flows
A. from her finger to the penny. B. from the penny to her finger. C. both ways. D. none of the above
Greenland is culturally and politically attached to Europe, yet geologically part of North America
a. True b. False Indicate whether the statement is true or false
The oceanic climate region(s) where the majority of strong tropical cyclonic storms are produced is ________
A) polar B) subpolar C) temperate D) subtropical E) tropical
A 1-kg block of iron has a weight of about
A. 10 N. B. 1 N. C. 5 N. D. more than 10 N.