Answer:
The answer should be C
Explanation:
If you look at the the graph, C points to the time period after mammals appeared. Since birds are mammals, they should have appeared after the time that mammals first came to be on Earth.
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Bedrock striations. Striations are marks or lines in the bedrock caused through glacial movement
Plant cells are bigger because they have bigger/larger Vacuoles.
These vacuoles hold water and food for the cell its like a storage for the cell.