Answer:
the answer is when you see cirrus clouds...
The source is the allele for beak size being different, or more specifically the DNA sequences being different.
2: most energy plants in the U.S. use coal as its fuel
<u>Answer:</u>
Option (3)
The arms mostly contains old blue and blue-white stars
<u>Explanation:</u>
Spiral arms are the regions in stars extending from the middle of spiral galaxies and the barred spiral. Those long, thin areas look like a spiral and therefore give their name to spiral galaxies.
Spiral arms, though, include many young, blue stars, that render their arms so bright (due to the high mass density and the fast stellar forming rates).
