What Is Still Lacking in the Hypothesis of an Asteroid

question 25

Multiple Choice

What is still lacking in the hypothesis of an asteroid impact as the cause of the end-Cretaceous mass extinction?

• A)evidence for what caused such high species loss after the impact
• B)evidence that an asteroid hit Earth at the time of the extinctions (65 million years ago)
• C)a convincing explanation of why mammals radiated after the event
• D)a convincing explanation of why some lineages survived while others vanished
• E)none of the above

---

Definitions:

Barbie

A popular fashion doll brand manufactured by the American toy company Mattel, Inc.

Cocaine Industry

The global illicit trade involved in the cultivation, manufacture, distribution, and sale of cocaine, a powerful stimulant drug.

Narcotics Police

A specialized division of law enforcement that is charged with combating drug trafficking and drug abuse.

Crack Dealers

Individuals involved in the illicit sales of crack cocaine, a potent and highly addictive drug.