Question: What percent of polychaetes produce yolk-rich eggs?
Answer: About 14% use a similar external fertilization but produce yolk-rich eggs, which reduce the time the larva needs to spend among the plankton, or eggs from which miniature adults emerge rather than larvae.
A single-select problem: Is the question answered in a satisfactory fashion?

Pick from: (a). yes. (b). no.
(a).