Conducted in 1953, the ________ experiments were designed to show what types of complex molecules might have formed in the Earth's primitive environment.
Fill in the blank(s) with correct word
Question 2
The energy radiated by a typical quasar requires that its black hole accrete about:
A) one solar mass a century.
B) one solar mass a decade.
C) one solar mass a year.
D) ten solar masses a year.
E) one solar mass a day.