Question

3
\mountainous regions such as the andes in south america have lower population densities than neighboring lowland areas. the high elevation results in cooler temperatures and thinner air, which can make agriculture and human habitation more difficult. steep slopes also pose challenges for transportation and construction. however, some people have adapted to these harsh conditions by developing terraced farming techniques and building infrastructure that can withstand the rugged terrain.\
what environmental factor is most responsible for lower population densities in the andes region?
a steep slopes and harsh terrain
b limited rainfall
c proximity to the ocean
d overpopulation in the lowlands

Explanation:

The passage explicitly states that high elevation (leading to harsh conditions) and steep slopes make agriculture, habitation, and infrastructure development difficult in the Andes, directly causing lower population density. The other options are not mentioned as relevant factors in the provided text.

Answer:

A. Steep slopes and harsh terrain