Chemical contamination is when chemicals from industries or harmful sprays in farming get washed off into bodies of water.
Answer: Public Good
Explanation:
In medieval Europe an important technological advance was the use of the padded horse collar for plowing.
Once this idea was thought of, other people used it. This illustrates that knowledge is generally a public good.
<span>Paleolithic society is often considered the original affluent society because hunter-gatherers lived in a society where every person's wants and needs were satisfied and that deprivation did not exist due to the fact that, needs were met with what was available and people did not desire to over-indulge. This is in stark contrast to the general perception of hunter-gatherers as struggling for their next meal or food, and also is an interesting opposition to the modern indulgent society based on consumption and greed.</span>
Answer:
variable-interval
Explanation:
In a variable-interval schedule, reinforcement is presented if the body emits at least one response after a variable interval of time. Generally, this scheme is represented by putting the average time of the variable interval. For example: VI-10min means that the booster is displayed after an average of 10 minutes and only for the first response issued.
The variable-interval schedule results in a high frequency of responses.
As Jennifer's company car repair and maintenance service completion times are unpredictable, it will likely be reinforced with positive answers to your questions. This is an example of variable-interval schedule.