If the galaxy is observed over time, which of the following observations would most strongly suggest that gravitational forces are acting throughout it? A. supernovae explosions B. the expansion of the universe C. the expansion of the galaxy D. the rotation of the galaxy

answer: the answer is option b

Explanation:

answer:

b

Explanation:

The correct answer is A. Saguaro Cacti, with the scientific name Carnegiea gigantea, which is very significant biotic feature to the Sonoran Dessert's ecosystem. The craziest fact about it is that it can grow up to 40 feet tall! The Sonoran Desert is a North American dessert, also. Some other critical biotic features of this desert include joshua trees, rattle snake, and red-tailed hawk. 

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                  - Dotz