A- Gravity. I believe it is gravity since that is the only one that makes sense in this situation. I hope i helped! :)
Answer:
A.
Explanation:
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The extermination of the dinosaurs, the start of a rise to dominance of mammals and a meteorite effect in mexico marks the boundary among the mesozoic and the cenozoic or as named as the k-p boundary. In addition, the cretaceous paleogene (K–Pg) boundary which is previously recognized as the cretaceous tertiary (K–T) boundary is a geological signature typically a thin band of rock.
The seven continents and the oceanic plates
