The discovery that the narrator makes by dissecting his brain is learning that his thoughts require a constant flow of pressurized air because brain activity slows due to low air pressure.
When we say essential appositive, this is the phrase that is considered as an important part of the sentence that describes the noun and cannot be omitted for this will change the thought of the sentence. Based on the given sentence above, the essential appositive would be "Famed Astronomer". The answer would be the first option.
Answer:
my mother is a math teacher
Explanation:
