The correct order of periods in the Paleozoic Era from oldest to most recent is:
1. Cambrian
2. Ordovician
3. Silurian
4. Devonian
5. Carboniferous
6. Permian
The given options only include four of these periods. Within those given, the order remains consistent with the full sequence: Silurian, Devonian, Carboniferous, Permian.
The given graph shows the range of variation among population members, for a trait determined by multiple genes. If this population is subjected to disruptive selection for several generations, which of the following distributions is most likely to result?
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :