Question

who are flyers? why does the author say so...​

Answer 1

Answer:

The author says that the flyers are known as birds, dinos... etc.

Answer 2

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Intergalactic gas is so tenuous that it emits no light of its own. ... Instead astronomers study it indirectly by observing how it selectively absorbs the light coming from faraway sources known as quasars.

${\underline {\sf {\bf {\purple {Mark~ as~ brainliest!!}}}}}$