Answer:
A vertebrate is an animal or species distinguished by its possession of a backbone or spinal column. Vertebrates can be insects, fish, mammals, birds, reptiles, and also amphibians.
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The sun. But at the center of our galaxy (Milky Way) is a supermassive black hole called Sagittarius A- star
19/3-3/4X=1/2X+5
76-9X=6X+60
-9X-6X=60-76
-15X=-16
16=15X
X=16/15
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