____________ galaxies contain a supermassive black hole at their centers while active nuclei are present in ____________of galaxies
a. Most; a few percent
b. Most; the majority
c. A small minority; a few percent
d. A small minority; the majority
Question 2
Star clusters are important to our study of stars because
a. all stars formed in star clusters.
b. the Sun was once a member of a globular cluster.
c. they give us a method to test the our theories and models of stellar evolution.
d. they are the only objects that contain Cepheid variables.
e. All of the other choices are correct.
Cultured HeLa cells have been stained with Hoechst turning their nuclei blue
Galaxies Forming by Combining Smaller Units
Ben Jones, Black Face and Arm Unit.
Mechanisms of Active and Passive Immunity
The major human endocrine glands and their central nervous system control centers
Active Continental Margins