Answer:
Genocide.
Explanation:
An intergroup relation refers to an interaction between individuals of different social groups and between the groups each one represent.
Genocide is the one that displays the least tolerance because it is intentional action to destroy a certain group of people defined as an ethnic, racial, religious, or social group.
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They helped to end apartheid
Answer:
alpha brainwaves are eventually replaced by theta
Explanation:
The various stages of sleep are categorized by the trends of each level of the brainwaves. The waves of the alpha are substituted by theta waves as an individual moves from waking to sleeping. In level 2 sleep arise sleep spindles and K-complexes.