Answer:
Texture
Explanation:
the rate at which the rock had cooled when molten magma was cooling gives out a clear comparrison of the rocks which is the texture
The statement that can be removed is --
Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again.
This above statement can be removed, without affecting the given excerpt's reliability.
Rest all the other statements are inter related and have the same meaning output.
the same goes for the other