Upon Close Inspection of Movement in Annelids and Nematodes, You

question 29

Multiple Choice

Upon close inspection of movement in annelids and nematodes, you would notice an obvious difference. Nematodes tend to wriggle back and forth, while annelids tend to contract along their length as their girth swells and then thin out as they stretch. What anatomical feature explains this type of movement?

• A) The annelids possess longitudinal muscle fibers that the nematodes lack.
• B) The nematodes lack circular muscle fibers.
• C) Nematodes lack a coelom.
• D) Annelids have a highly specialized nervous system capable of more complex movements.

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Definitions:

Facial Expressions

The movements of the muscles beneath the skin of the face, used as non-verbal communication to convey emotions and reactions.

Posture

The way in which someone holds their body when standing or sitting, often reflecting confidence, attitude, or current state of health.

Vocal Intonations

The variation in pitch while speaking, which can affect the meaning, emotion, or emphasis conveyed by the speaker.

Intrusive Rock

An igneous rock that solidified from magma below Earth’s surface; synonym: plutonic rock.