The Sipunculans Live in Burrows and Feed on Sediment Deposits

question 38

Multiple Choice

The Sipunculans live in burrows and feed on sediment deposits using

• A)a non-retractile spoon-shaped proboscis.
• B)a chitinous cuticle.
• C)a segmented opisthosoma.
• D)a retractile introvert with ciliated tentacles.
• E)None of the choices is correct.

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Definitions:

Neural Messages

Electrical and chemical signals that are transmitted by neurons to send information throughout the nervous system.

Optic Nerve

A cranial nerve that transmits visual information from the retina to the brain.

Light Rays

Streams of photons that move in a straight line and are responsible for allowing the human eye to see and perceive the world around.

Encoding

The initial process of transforming information into a form that can be stored in memory.