The correct answer is: Nobody knows everything he or she can about the brain.
Explanation:
There are different types of pronouns. They help to replace the noun in a sentence. In this case, the word "<em>Nobody</em>" is part of the indefinite pronouns and they are always used in the singular. So, it is necessary to change the personal pronoun "<em>They</em>" for the singular "<em>He or She</em>".
Answer:
With more facts
Explanation:
In your paragraph:
Identify the opposing argument.
Respond to it by discussing the reasons the argument is incomplete, weak, unsound, or illogical.
Provide examples or evidence to show why the opposing argument is unsound, or provide explanations of how the opposing argument is incomplete or illogical.