You are given a sentence and your task is to generate another sentence that supports the given input.
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Question: Features of pollen grains used in identification are size, shape, thickness of the exine (outer wall) and intine (inner wall) of the pollen grain.

Answer: Each pollen grain has two coverings: the exine (thicker, outer layer) and the intine.


Question: The Sun's gravity is what keeps the planets in orbit.

Answer: Gravity is responsible for the orbits of the planets around the sun.


Question: In most prokaryotic bacteria, this is done by the process of binary fission, where two daughter cells are formed that are a replica of the parent cell.

Answer:
Binary fission is a form of cell division in prokaryotic organisms that produces identical offspring.