Star X has a magnitude of -30. Star Y has a magnitude of -25. Which of the following statements is true?
Star Y is brighter than Star X
Star X is older than Star Y.
The brightness ratio is 99.8: 1.
The absolute magnitude of Star X is 30.

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.