Briefly explain the dose-response relationship
What will be an ideal response?
The dose-response relationship allows scientists to quantify the toxicity of a given substance by measuring how much effect a toxicant produces at different doses or how many animals are affected by different doses of the toxic agent. Dose is the amount of toxicant the test animal receives, and the response is the type or magnitude of negative effects the animal exhibits as a result.
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Why did Alexander du Toit feel it was necessary to propose a northern landmass he named Laurasia?
A)Pangaea did not account for all known landmasses. B)The landmass helped resolve climatological inconsistencies. C)Paleomagnetic studies of the seafloor proved its existence. D)A large mass of Gondwana had broken off and drifted northward. E)Recent ocean voyages discovered remnants of its existence.
Both pyrolysis and gasification are ways of producing ________ from ________
A) methane and diesel fuels; biomass B) hydroelectric fuel; coal C) coal; biomass D) biodiesel; limestone E) pesticides and fertilizers; biomass
There are as many as four hundred different groups of Aborigines currently in Australia that make up a total population of about four hundred fifty thousand.
a. true b. false
World population has been growing more and more rapidly over the past several millennia.
Answer the following statement true (T) or false (F)