I assume that the question here refers to the process of evolution. The "helpful variations" are small mutations that allow the organism to have a small advantage over other - and this organism can then pass this variation to its children better than other organisms, meaning that with time, more organisms will have it. This will accumulate over time and the percentage of organisms with this mutation will increase.
Here are the answers that would best complete the given statement above. <span>The first major antipsychotic drug to be introduced was CHLORPROMAZINE; it was used to treat SCHIZOPHRENIA. Hope this is the answer that you are looking for. Have a great day!</span>
Answer:
Democracy is one of the general core values and principles of the United Nations, and respect for human rights and fundamental freedoms are essential elements of democracy.
Explanation:
The correct answer is B. It becomes gradually weaker
Explanation:
A stimulus refers is an object, sound, situation, etc. that causes a reaction or response, in terms of behavior or reaction, for example, in the case presented the sound of the bell paired with the food causes the dog to salivate, which is reinforced if the stimulus is presented multiple times. However, if the stimulus that leads to the response disappears the response will also disappear over time; therefore, if the bell is presented without food (stimulus) the response will become gradually weaker and therefore the dog will stop salivating.
<span>A.powers not expressly forbidden in the constitution</span>