Question

question 10
the fossil record for an organisms lineage reveals that speciation occurred within a population. the individuals of the new species were recognizably more complex than individuals in the ancestral species. after the period of rapid change, the species showed little change for an extended period of time. which processes played an essential role in developing this complex species? choose two correct answers.
a. stasis
b. gradualism
c. punctuated equilibrium
d. extinction of the ancestral species

Explanation:

1. Punctuated equilibrium: This evolutionary model describes patterns where species undergo rapid, short bursts of evolutionary change (like the speciation and increase in complexity here) followed by long periods of stability. This matches the scenario's rapid change + extended little change.
2. Stasis: Stasis refers to the long period of little to no evolutionary change after the rapid speciation event, which is explicitly noted in the description.
3. Gradualism describes slow, steady change over time, which contradicts the "rapid change" noted. The extinction of the ancestral species is not mentioned or required for this scenario.

Answer:

A. Stasis
C. Punctuated equilibrium