Earthworms Use Their Hydrostatic Skeletons to Move Through the Soil

question 36

Multiple Choice

Earthworms use their hydrostatic skeletons to move through the soil.As earthworms move through the soil they

• A)contract their circular muscles,which press their longitudinal muscles,which in turn stretch to elongate the segments of their bodies.
• B)contract their longitudinal muscles,which press their circular muscles,which in turn stretch to elongate the segments of their bodies.
• C)contract their circular muscles,which stretch their longitudinal muscles,which in turn stretch to enlarge the segments of their bodies.
• D)contract their circular muscles,which press their clitellum and attached setae into the burrow;with the setae as anchors,the earthworms are able to pull their bodies through the soil.
• E)contract their longitudinal muscles,which compress their circular muscles,which in turn reduce each segment's circumference allowing forward movement.

---

Definitions:

Required Rate of Return

The minimum annual percentage return investors expect or demand from an investment, considering the risk involved.

Risk Averse

A description of an investor or investment philosophy that prioritizes the minimization of risk over potential returns.

Risk-free Rate

The theoretical rate of return on an investment with no risk of financial loss, typically represented by government bonds.

Market Risk Premium

The additional return an investor requires for holding a risky market portfolio instead of risk-free assets, reflecting the extra risk.