What evidence supports the galactic fountain model?
A) We see a jet of ionized gas shooting out of the bulge of our galaxy.
B) We have mapped several spiral arms of the Milky Way Galaxy.
C) We see hot gas above the disk of the galaxy and cool gas that appears to be raining down from the halo.
D) We have observed a lot of water molecules in the interstellar medium.
E) We have no evidence yet for the galactic fountain model.
Question 2
Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then.
B) We didn't have the resolution to observe galaxy clusters until then.
C) The Milky Way was blocking our view of distant galaxy clusters.
D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed.
E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.
The threespine stickleback (Gasterosteus aculeatus) has been used as a model organism for the study
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