The Smallest Time Division on the Geologic Time Scale Is

question 29

Multiple Choice

The smallest time division on the geologic time scale is a(n)

• A)era.
• B)epoch.
• C)eon.
• D)period.

---

Definitions:

Scolex

The head region of a tapeworm, containing suckers or hooks for attaching to the host's intestinal wall.

Nematocyst

A specialized cell in the tentacles of a jellyfish or other cnidarians, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey.

Ascaris

A genus of parasitic nematode worms which can cause the infection ascariasis in humans through ingestion of eggs from contaminated sources.

Roundworm

Invertebrates with nonsegmented cylindrical body covered by a cuticle that molts; some forms are free-living in water and soil, and many are parasitic.