What is the man difference between prokaryotic cells and eukaryotic cells

The main difference would be that prokaryotic cells are thought to not have a "true nucleus", as well as only having one single floating strand of DNA/Chromatid. Eukaryotic cells have a nucleus as well as a nucleolus, and many strands of chromatid and DNA.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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