Acute exposure to an environmental toxin a. involves low levels of exposure over long periods of time b. makes it difficult to associate the symptoms with a cause c. are high exposures over short times and associated with a specific cause d. is usually untreatable and fatal e. is the case with chronic alcohol and nicotine abuse

The correct answer is "are high exposures over short times and associated with a specific cause"

Acute exposure is defined as exposures to high amounts of toxic substance over a period of time associated with a specific cause. For instance, acute exposure to malathion (insecticide) will produce acute effects of acute paralysis or weakness, respiratory depression, or even death. While usually fatal, it is usually treatable.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.