What is it called when a sound wave is slowed by a new medium that it is passing through? echo
absorption
sonar
transmission

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

well we can't tell you because we cant see the time give a screen shot or something.

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

hope this !

the answer is d p: cell, q: organ, r: organ system, s: tissue