What evidence leads astronomers to conclude that galaxies' shapes may be affected by the environment in which they are located?

Question

Quizplus · Accepted Answer

The different fractions of galaxy types in rich clusters and poor clusters suggest that environmental factors play a role in shaping galaxy morphology. Rich clusters are denser and may have more interactions between galaxies, leading to a higher fraction of elliptical galaxies, while poor clusters have lower densities and may have more isolated galaxies, leading to a higher fraction of spiral galaxies. The other options (A, B, and C) do not directly suggest a link between environment and galaxy shapes.

What Evidence Leads Astronomers to Conclude That Galaxies' Shapes May