Answer:
d. neutral stimulus and an unconditioned stimulus
Explanation:
- A classical conditioning is the learning through the voluntary paired associations and it occurs when a neutral stimulus is paired with an associated with an unconditioned stimulus to give a conditioned response. And is characterized by the person that makes a learned behavior with a learned behavior and a cue in the environment.
Answer:
E. abandoned, vacant factories, warehouses, and residential sites that may be contaminated from past uses.
Explanation:
A brownfield refers to a land that was used in the past for industrial or commercial activities which is not currently being used and that can be contaminated. According to this, the answer is that a brownfield is an urban area of abandoned, vacant factories, warehouses, and residential sites that may be contaminated from past uses.
Hey there,
Your question states: <span>How did the calculation of pi help mathematicians during the Gupta period?
My best guess that I would give would be the option B. </span><span>
The value of pi helped them explain that Earth is a rotating sphere. Because they used the </span>

to help them, just as we use that in math.
Hope this helps.
~Jurgen