The Oldest Era in the Phanerozoic Eon Is the ______________

question 68

Short Answer

The oldest era in the Phanerozoic eon is the ______________ era.

---

Definitions:

Secondary Stimulus

A stimulus that acquires the capacity to evoke a conditioned response after being paired with a primary stimulus.

Acquisition

The process of learning or obtaining new information, skills, or responses, as in the initial stage of conditioning in psychology.

Electric Shock

A sudden discharge of electricity through a part of the body, causing injury or involuntary muscle contraction.

Flatworm

A type of simple invertebrate animal with a flat, soft body, many of which are parasites or live in water.