Which characteristics are considered most typical of an old galaxy in decline?

Question

(1 point)
spiral, abundant planets present
shrinking in size, high dust content
low gas content, little star formation
very bright, relatively small

Answer 1

The characteristics that are considered most typical of an old galaxy in decline are:

low gas content, little star formation

Old galaxies often have depleted gas reservoirs, leading to reduced star formation activity. As galaxies age, they can exhaust their gas supply, resulting in fewer new stars being formed.