The formation process for supermassive black holes is linked with the formation of galactic ____.
a. disks
b. clusters
c. central bulges
d. coronae
e. halos
Question 2
A shift in the position of an emission line of an element toward the red or blue is produced by ____.
a. atoms that become ionized
b. electrons that transfer from a high energy level to a low energy level
c. electrons that transfer from a low energy level to a high energy level
d. the intensity of agitation of atoms in a hot gas
e. the motion of an object toward or away from the observer
Black flies are blood-sucking insects who vector disease, like River Blindness, while feeding on hum
black-tailed jackrabbit (Lepus californicus)
black widow
Formation of the Himalayas
Formation of Concentrated Urine
The chromosomal explanation of the results of the X-linked crosses