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14. Star clusters are held together by gravity. It really depends how old a star in the cluster is - it could be just born, or could have been born hundreds of billions of years ago. Astronomers categorize them by different colors, temperatures, sizes, brightness, etc.
15. Open clusters eventually disperse to form field stars.
16. Our sun is not part of a cluster (although it used to be).
17. Globular clusters<span> </span>are<span> found in the ring of a galaxy and usually contain more stars and </span>are<span> much older than the </span>open clusters.
18. Omega Centuari and M13.
Hope this helps!
The type of fat which is most likely a solid at room temperature would be saturated fat. If you think of olive oil and canola oil, both of them are liiquid at room temperature. If you're thinking of lard, it's hard at room temperature.
A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.