Answer: a
Eon, Era, Period
Explanation:
There may be 2 or more Eras in an Eon, and at least two Periods in an Era.
For example, The Phanerozoic Eon consists of the Cenozoic, Mesozoic, and Paleozoic Eras.
The Mesozoic Era consists of the Cretaceous, Jurassic, and Triassic Periods.
The following are context clues phrases in the passage examples and syntax
The theme of Autumntime represents progress because if nature is not valued and protected ,nature which is present in the world today may not be present in the future.
Textual Evidence: A. Lentini writes, <em>“In the yard was a live tree—an oke was what Mom called it. When the news of the tree’s discovery leaked out, quite a few sightseers stopped by to have a look at it, and the local government, realizing the money-making potential, began charging admission and advertising the place. By now it had become a favorite spot for school field trips and family excursions such as ours.“ (‘Autumntime”)</em>
<em>The teller of the book Autumntime means that real live trees are rare in his community . People in society felt that buildings were more important than nature and trees were no longer valued .One tree remained in that community and soon that tree will be gone as well.</em>
