Humans are thought to have evolved from a mixture of environmental and humanbased selective pressures. Changes in resource availability and forced some populations of primates to become as they traveled across long distances, freeing hands for tools and complex tasks. Later, large animals required communication, while rival groups of humans selected further for intelligence. Humans are thought to have evolved from a mixture of environmental and h based selective pressures. Changes in resource availability and forced some populations of primates to bec as they traveled across long distances, freeir for tools and complex tasks. Later, large anin required communication, while rival groups o selected further for intelligence. Humans are thought to have evolved from a mixture of environmental and humanbased selective pressures. Changes in resource availability and forced some populations of primates to become as they traveled across long distances, freeing hands ater, large animals required communication, while rival groups of humans selected further for intelligence. Humans are thought to have evolved from a mixture of environmental and hum based selective pressures. Changes in resource availability and forced some populations of primates to becor as they traveled across long distances, freeing for tools and complex tasks. Late required communication, while al groups of h selected further for intelligence. Humans are thought to have evolved from a mixture of environmental and humanbased selective pressures. Changes in resource availability and , forced some populations of primates to become as they traveled across long distances, freeing hands for tools and complex tasks. Later, large animals required communication, whi rival groups of humans selected further for intelligens.

1. Humans are thought to have evolved from a mixture of environmental and humanbased selective
pressures. Changes in resource availability and forced some populations of primates to become
as they traveled across long distances, freeing hands for tools and complex tasks. Later, large
animals required communication, while rival groups of humans selected further for intelligence.
Humans are thought to have evolved from a mixture of environmental and h based selective
pressures. Changes in resource availability and forced some populations of primates to bec as
they traveled across long distances, freeir for tools and complex tasks. Later, large anin required
communication, while rival groups o selected further for intelligence. Humans are thought to
have evolved from a mixture of environmental and humanbased selective pressures. Changes in
resource availability and forced some populations of primates to become as they traveled across
long distances, freeing hands ater, large animals required communication, while rival groups of
humans selected further for intelligence. Humans are thought to have evolved from a mixture of
environmental and hum based selective pressures. Changes in resource availability and forced
some populations of primates to becor as they traveled across long distances, freeing for tools
and complex tasks. Late required communication, while al groups of h selected further for
intelligence. Humans are thought to have evolved from a mixture of environmental and
humanbased selective pressures. Changes in resource availability and , forced some populations
of primates to become as they traveled across long distances, freeing hands for tools and
complex tasks. Later, large animals required communication, whi rival groups of humans
selected further for intelligens