Question
These organisms’ eyes possessed calcite lenses and were some of the first examples of compound eyes. For 10 points each:
[10m] Identify this class of extinct ancient marine arthropods. They contain a hard exoskeleton and have a body divided into three sections.
ANSWER: trilobites [or Trilobita]
[10e] Trilobites first evolved during this geological period where most extant animal phyla emerged. This geological period saw the rapid diversification of life in its namesake “explosion.”
ANSWER: Cambrian period [accept the Cambrian explosion]
[10h] Because of their wide distribution and sudden appearance, trilobites are often used as these types of standard fossils. These fossils are contrasted with zone fossil, which help determine a fossil’s biozone.
ANSWER: index fossils [accept guide or indicator fossils]
<Biology>
Summary
| 2024 ACF Fall at Cornell | fall | Y | 9 | 21.11 | 100% | 89% | 22% |
| 2024 ACF Fall at Ohio State | fall | Y | 8 | 17.50 | 100% | 75% | 0% |
| 2024 ACF Fall at Washington | fall | Y | 6 | 16.67 | 100% | 67% | 0% |
| 2024 ACF Fall at Georgia | fall | Y | 11 | 19.09 | 100% | 55% | 36% |
| 2024 ACF Fall at North Carolina | fall | Y | 9 | 15.56 | 89% | 44% | 22% |
| 2024 ACF Fall at Claremont Colleges | fall | Y | 5 | 26.00 | 100% | 100% | 60% |
| 2024 ACF Fall at Rutgers | fall | Y | 8 | 17.50 | 100% | 50% | 25% |
Data
| UCLA C | Claremont C | 10 | 10 | 10 | 30 |
| UCLA A | UCLA E | 10 | 10 | 10 | 30 |
| Claremont A | UCLA B | 10 | 10 | 0 | 20 |
| UCLA D | UCSD | 10 | 10 | 10 | 30 |
| USC | Claremont B | 10 | 10 | 0 | 20 |