The orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy.
a. I
b. IV
c. I & IV
d. II & IV
e. I & III
Question 2
Opacity is
a. the balance between the pressure and force of gravity inside a star.
b. the force that binds protons and neutrons together to form a nucleus.
c. the force that binds an electron to the nucleus in an atom.
d. a measure of the resistance to the flow of radiation (photons) through a gas.
e. the temperature and density at which a gas will undergo thermonuclear fusion.
Genetic drift and population size.
Anatomy of the Lotka-Volterra equations for predator-prey population growth.
A laser-guided observation of the Milky Way Galaxy at the Paranal Observatory in Chile in 2010.
The level of future emissions is closely linked to the rate of population growth
World Population, 10,000 B.C. to A.D. 2010
Population growth