Imagine That a Researcher Is Studying Two Different Beaver Populations

question 121

Multiple Choice

Imagine that a researcher is studying two different beaver populations. One of these populations consists of beavers with larger, rather unwieldy teeth that make eating difficult but that allow the beaver to take down very large trees. The other population consists of individuals with smaller teeth that make eating easier, but which are still capable of chewing through the wood of small trees. When a beaver dam fails, the two populations merge. Hybrids with medium-sized teeth are poorly adapted to the environment: Their teeth are too big to make eating easy, but they are not big enough to permit the felling of large trees. If a mutation arises that causes beavers with smaller-sized teeth to preferentially mate with individuals having the same size teeth, this would result in reinforcement of _____ isolation.

• A)reproductive
• B)species-size
• C)analogous character
• D)temporal species
• E)ecological species

---

Definitions:

Risk-Free Rate

The rate of return on an investment with no risk of financial loss, often represented by the yield on government securities.

Evolution of Beta

The changes in Beta over time, reflecting how a security's volatility relative to the market can vary with different market conditions or company developments.

Forecast

Prediction or estimation of future events or trends, especially regarding economics or weather.

Forecasted Market Return

An estimation of the future returns that will be generated by the market over a specific period.