Influences on Darwin

human populations grow faster than the resources they depend on. When populations become too large, famine and disease break out. In the end, this keeps populations in check by killing off the weakest members.

organisms altered their behavior in response to environmental change. Their changed behavior, in turn, modified their organs, and their offspring inherited those "improved" structures.

Gradual geological processes have shaped the Earth's surface making Earth much older than believed.

His father

His grandfather

His Aunt

His Mother

continual increases in population size.

an unchanging local environment.

the actions of organisms as they use or fail to use body structures.

the natural variations already present within the population of organisms.

James Hutton

Charles Darwin

Alfred Wallace

Charles Lyell

without certain checks on population size, there would soon be insufficient food for the growing human population.

in the human population, people die faster than babies are born.

in the 1700s, England needed more housing.

the majority of a species’ offspring die.

True

False

True

False