    Sentence 1; 3 It should be noted that the  toxicity (LCs0) of a sample observed in a  range-finding test may. be significantly  different from the toxicity observed in the  follow-up chronic definitive test (1) the  definitive test is longer; and (2) the test may  be performed with a sample collected at a  different “time, and. possibly differing  significantly in the level of toxicity.    Sentence 2: The toxicity of a sample in the  range-finding test-might be very different  from the toxicity in the follow-up test.