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Answer: A
Explanation: The spindle fibers bring the chromosomes together in prophase then apart in telophase.
If an object has a higher density than the fluid it is in (fluid can mean liquid or gas), it will sink. If it has a lower density, it will float. Density is determined by an object's mass and volume. If two objects take up the same volume, but have one has more mass, then it also has a higher density.
Gravity because the earth's gravity is what's causing it to orbit it
