"Homogeneous" here means "uniform", "consisting of parts which are all of the same kind".  (Contrast "homogenous" which, according to the OED and Webster, is a biological term meaning "having a common descent or origin", and is applied to "organs of different organisms which show a correspondence of structure due to derivation from a common ancestor".  "Homogenous" is commonly but mistakenly used as a synonym for "homogeneous".)

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