Humans Are Dimorphic; That Is,they Come

question 18

Multiple Choice

Humans are dimorphic; that is,they come

• A) with two of most things.
• B) from a two-layered embryo.
• C) with a two-lobed brain.
• D) in two standard models: female and male.
• E) with two bilaterally symmetrical halves.

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Definitions:

Radula

A rasplike structure in the digestive tract of chitons, snails, squids, and certain other mollusks.

Annelids

A phylum of invertebrate worms known as segmented worms, which includes earthworms, leeches, and polychaetes.

Segmented Body

The body plan characteristic of certain organisms, including arthropods and annelids, where the body is divided into segments.

Visceral Mass

The concentration of body organs (viscera) located above the foot in mollusks.