The various Galpagos finch species
A) evolved in South America and flew to the Galpagos Islands.
B) evolved from a single ancestral species that flew to the Galpagos Islands.
C) all feed on the same diet in the Galpagos Islands.
D) are primarily different because of variations in the structure of their feet.
Question 2
Many of the 1.3 billion people who lack electricity live in rural regions where
A) nuclear energy is most useful.
B) hydroelectric energy is the best energy resource.
C) hydrogen fuel cells are most useful.
D) solar energy is most useful.
Roots of the keystone species hypothesis: does a higher proportion of predators in diverse communiti
Endangered species
Primatologist Volker Sommer and his colleagues showed that langur infanticide had adaptive value and
Air-Mass Source Regions for North America
Sheep in Falkland Islands