<span>The first generalization is that the spread of enlightenment was the beginning of the age of exploration. With the thirst for knowledge, people wanted to learn more about the world. The second generalization is that with science on the rise, people began to question the foundations of religion.</span>
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Neurons and other components come together to form nerve tissue
The brain is formed of many different parts and types of tissues
The central nervous system runs through the body and consists of many parts
A human being has many different systems
Examples of chemical mutagens would be nicotine and other compounds in cigarette smoke that cause mutations involved in lung cancer.