In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Several radioactive substances are considered carcinogens , but their carcinogenic activity is attributed to the radiation , for example gamma rays and alpha particles , which they emit .
The carcinogens in them are caused by the radiation they release , such as gamma rays or alpha particles .

Silliness is defined as engaging in " a ludicrous folly " , showing a " lack of good sense or judgment " , or " the condition of being frivolous , trivial , or superficial " .
Silliness is when a person acts like a fool , or shows a lack of good sense or judgment .

They retract their claws back into their paws , which grants them silent movement and protecting them from leaving distinctively incriminating pawprints that alert people to their actions .

They put their claws back into their paws so they can move without noise and not leave footprints .

