messenger. find out what's happening in the world as it unfolds. just watched "it's not the cow, it's the how." replay more videos ... must watch "it's not the cow, it's the how." : (cnn)the average american eats nearly pounds of beef ( kg) a year -- roughly equal to a couple of hundred burgers. but for...
for the assessment of acute effects than for chronic effects. view full glossary lr lethal rate (lr ) is an indication of the lethal toxicity of a given substance, representing a rate at which % of subjects die. view full glossary pesticides "any substance or mixture of substances used to alter the...