Which is a measurement of the temperature left over from the big bang?
a.
doppler shift of galaxies
b.
doppler shift of stars
c.
frequencies of radio galaxies
d.
cosmic background radiation

What was the direct cause of the u.s. entry into world war ii? a. the bombing of pearl harbor b. the invasion of poland by germany c. the capture of belgium by germany d. the battle of britain

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

1.3.3 quiz: primary and secondary sourcesquestion 4 of 102 pointsa secondary source is reliable and credible if the person who created thesource is an expert on the topic, is educated and respected in the field ofstudy, and: