____ in Various Alloyed Forms Was Used by Prehistoric Man

question 6

Multiple Choice

____ in various alloyed forms was used by prehistoric man because of its presence in the meteoric iron used to produce tools.

• A) Titanium
• B) Zinc
• C) Tin
• D) Nickel

---

Definitions:

Unconditioned Stimulus

is a stimulus that innately and involuntarily prompts a reaction without the necessity for previous learning.

Conditioned Stimulus

In classical conditioning, a previously neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.

Conditioned Response

A learned response to a previously neutral stimulus that has been repeatedly presented along with an unconditioned stimulus.

Conditioned Stimulus

A once-neutral cue that, after being paired with an unconditioned stimulus, eventually induces a conditioned response.