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An acute toxicity test is conducted to assess effects of a short-term exposure of organisms to a test material under specific experimental conditions. An acute toxicity test does not provide information concerning whether delayed effects will occur and typically evaluates effects on survival. A chronic test is typically longer in duration and includes a sublethal endpoint to assess effects on a population that might occur beyond the exposure period. Because the echinoderm embryo development test includes a sublethal endpoint, but is also short in duration, these tests are considered to be short-term chronic tests, consistent with EPA guidance.
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