It Was During the ________ Period Within the ________ Era

question 56

Multiple Choice

It was during the ________ period within the ________ era that chordates made their first appearance.

• A)Cambrian,Paleozoic
• B)Ordovician,Paleozoic
• C)Mesozoic,Cretaceous
• D)Paleozoic,Cambrian

---

Definitions:

Appropriate US

An unconditioned stimulus that naturally induces an unconditioned response without the need for prior learning or conditioning.

Geometric Figure

A shape or form consisting of lines and angles, defined in geometry.

Brain-Wave Response

Electrical patterns in the brain that reflect different states of consciousness or activity, which can be measured with an EEG (electroencephalogram).

Generalization

The process in psychology by which a response is made to a stimulus similar to the one that originally elicited the response.