_____ Structures Probably Indicate Descent from a Common Ancestor with Modifications

question 26

Multiple Choice

_____ structures probably indicate descent from a common ancestor with modifications for different functions.

• A) Homologous
• B) Analogous
• C) Vestigial
• D) Derived
• E) Primitive

---

Definitions:

Classical Conditioning

A learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus, leading to a learned response.

Strange Sound

An unusual or unexplained noise that is not normally heard and can cause curiosity or concern.

Predictability

The ability to forecast future events or behaviors based on current or past information.

CS and US

In classical conditioning, CS stands for Conditioned Stimulus, which becomes associated with an Unconditioned Stimulus (US) to produce a learned response.