Why could organisms change in a way similar to a mountain even though organisms don't live as
long as mountains last?

Organisms change gradually through evolution on a timescale similar to the formation or "evolution" of mountains.

Explanation:

Organisms may have lifespans of irrelevant length compared to a mountain, but just as mountains are slowly formed over eons, organisms gradually change and diversify through evolution.

Organisms live and die to weed out inefficiencies in their species—over time, the adaptations formed by evolution drastically change the organism, mirroring the gradual change of flat land on a tectonic plate forming a sky-high mountain.

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b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.