Points points points !

ty for points ☺️

Explanation:

A membrane is a thin layer of something. ... Membranes are thin and flexible, but usually still strong enough to protect what's inside or underneath them. Biologists often study membranes, such as those that surround your cells and organs.

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i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

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