Read the Following Paragraphs and Answer the Questions After Each

Essay

Read the following paragraphs and answer the questions after each paragraph.
Consider three ideas, proposed in perfect seriousness to explain that greatest of all titillating puzzles-the extinction of dinosaurs. Since these three notions invoke the primally fascinating themes of our culture-sex, drugs, and violence-they surely reside in the category of fascinating claims… .
1. Sex: Testes function only in a narrow range of temperature (those of mammals hang externally in a scrotal sac because internal body temperatures are too high for their proper function). A worldwide rise in temperature at the close of the Cretaceous period caused the testes of dinosaurs to stop functioning and led to their extinction by sterilization of males.
2. Drugs: Angiosperms (flowering plants) first evolved toward the end of the dinosaurs' reign. Many of these plants contain psychoactive agents, avoided by mammals today as a result of their bitter taste. Dinosaurs had neither means to taste the bitterness nor livers effective enough to detoxify the substances. They died of massive overdoses.
3. Disasters: A large comet or asteroid struck the Earth some 65 million years ago, lofting a cloud of dust into the sky and blocking sunlight, thereby suppressing photosynthesis and so drastically lowering world temperatures that dinosaurs and hosts of other creatures became extinct
-Stephen Jay Gould
-How does the author organize this paragraph?