1.) the difference in the brightness of two stars with the same surface temperature is attributable to their colors densities ages sizes 2.) most responsible for the formation of a star is force. electromagnetic gravitational interstellar nuclear 3.)which main-sequence stars are the most massive? yellow orange red blue 4.) a spinning neutron star that appears to give off radio wave pulses is called a supernova white dwarf pulsar black hole 5.) greater redshifts in the spectra of galaxies indicate faster speeds lower temperatures slower speeds higher temperatures

Answers: 1 .The difference in the brightness of two stars with the same surface temperature is attributable to their sizes.( last choice)

2.Most responsible for the formation of a star is gravitational force.(second choice )

3. Blue ( last choice)

4.

A spinning neutron star that appears to give off radio wave pulses is called a pulsar ( third choice)

5.Greater redshifts in the spectra of galaxies indicate faster speeds ( first choice)

d

explanation:

the higher the instrument the better

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.