When a nuclear power accident occurs,
a.) all of the effects are seen immediately
b.) the effects are powerful yet fleeting
c.) only a small radius surrounding the accident is affected
d.) radiation may stick around for a long time and cause cancer

When a nuclear power accident occurs - D.) radiation may stick around for a long time and cause cancer

When a person is exposed to very high levels of radiation during any nuclear accident, many ailments can occur like- skin burns etc. The after effects of such radiations are very slow and steady and can result in gene changes in persons. These effects can stay in next generation births as well. It can also result in long-term health effects such as cancer and cardiovascular diseases.

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explanation:

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not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.