The answer is that <span>healthy </span>legs<span> have </span>veins<span> with smooth, elastic walls that </span>are<span> perfectly designed to </span>adapt<span> to the changes in pressure within a </span>vein<span>. </span>Veins<span> have </span>valves<span> that keep blood moving in one direction: back toward the heart. As the </span>leg<span> muscles </span>are<span> activated, the </span>venous valves<span> open to </span>allow<span> one-way flow in the direction of the heart.</span>
A.) They increased the personal freedoms of enslaved African Americans
Answer:
classical conditioning.
Explanation:
Classical conditioning: In psychology, the term classical conditioning was proposed by one of the most influential psychologist and behaviorist named Ivan Pavlov. He has discovered the classical conditioning theory while experimenting on dogs and has included a few basic terms associated with it including unconditioned stimulus, unconditioned response, the conditioned stimulus, and conditioned response.
Classical conditioning is described as a learning theory that involves a conditioned stimulus that gives rise to a conditioned response after connecting with an unconditioned stimulus.
In the question above, the technique best illustrates the classical conditioning.
Answer:
A. Speaker 2
Explanation:
The Articles of Confederation is known as the first written American constitution. It has its origins in times of war, also, its development was delayed since people were afraid of central authority and states demanded their lands, until it was sanctioned on March 1, 1781. These articles recognized the states' sovereignity and independency, leaving Congress as an auxiliary resource to solve certain issues, and not having the power to collect taxes or mint money. It was a weak central government, which eventually led to the Constitutional Convention in 1787 that modified and elaborated new federal laws.
