3.) Which of the following would be an appropriate measure of population density?
A) the number of African elephants (Loxodonta africana)
B) the number of African elephants (Loxodonta africana) and the grasses on which the elephant feeds per square mile
C) the number of African elephants (Loxodonta africana) and humans per square mile
D) the number of African elephants (Loxodonta africana) per square mile

4) Diseases can spread rapidly in cities. If a disease kills many people in a city but fewer in a rural area, this is an example of
A) exponential population growth.
B) density-independent factors.
C) logistical population growth.
D) density-dependent factors.