In 1896, the french scientist henri becquerel discovered
a. light-emitting polymers.
b. a process to turn natural rubber into a hard, stretchable polymer.
c. radioactive decay.
d. how to make alloys.

Bella is going to write a research paper. she chose sports as her topic, but her teacher said she must narrow or limit her topic. choose the topic that limits the broad topic of sports the most. a) a history of sports in the united states b) a history of tennis c) rules and etiquette of tennis d) training and equipment for outdoor sports