What may occur as a result of importing exotic birds for use as household pets? 

A)  a 20% animal death rate 
B)  improved health of the pet owner 
C)  the species becoming endangered or threatened 
D)  increased tourist revenues in the exporting countries

A population's growth rate will increase as the population reaches its carrying capacity.

Magnetic patterns develop on the seafloor as basaltic lava erupts and cools, and:

A) iron-rich minerals align with Earth's magnetic field
B) iron-rich minerals align parallel to the oceanic rift
C) silicic minerals align with Earth's magnetic field

Deserts are primarily located in hot,tropical regions.

What is one of the two ways in which urban areas grow? 

A)  by immigration 
B)  low incidence of disease 
C)  by unnatural increase 
D)  low death rates

Which term refers to a species whose role in an ecosystem is much more important than its abundance would suggest? 

A)  non-native species 
B)  specialist species 
C)  native species 
D)  keystone species