Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time.

CRD: Expanding Earth: the continents used to cover the whole Earth, but the Earth grew, and the continents separated.

Explanation
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Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time.
Earth's mass has grown with the volume in such a way that the surface gravity has remained constant.
Earth's gravity at its surface has increased over time, in line with its hypothesized growing mass and volume.
The mass of the solid/liquid Earth has remained the same, but with expansion, surface gravity decreased, and it has lost a lot of its atmosphere.

Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time.

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This doesn't explain the dinosaurs.

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