Crash Course - Biology (2025) # 7: "How we saved the Bald Eagle"

What is the study of a single species within a specific area called?

• Ecosystem ecology

• Community ecology

• Population ecology

• Biodiversity studies

What was a significant factor contributing to the severe decline of the Bald Eagle population by the mid-20th century?

• Increased predation

• Habitat loss

• Changes in climate

• Introduction of invasive species

In population ecology, what does density measure?

• The total number of individuals in a population.

• The spacing pattern between organisms.

• The number of organisms within a specific area.

• The rate at which a population grows or shrinks.

Which of the following organisms typically exhibits a clumped dispersion pattern due to their mating and social behaviors?

• Dandelions

• Sage plants

• Rural coyotes

• Mexican free-tailed bats

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What information is included in demographics when studying a population?

• The age, sex, and offspring potential of individuals.

• The geographical distribution and migration patterns.

• The diet and hunting habits of the species.

• The genetic diversity and evolutionary history.

What conditions are necessary for a population to experience exponential growth?

• Limited resources and high predation.

• Unlimited resources and no natural predators.

• Stable birth rates and fluctuating death rates.

• High competition and frequent disease outbreaks.

Which of the following is an example of a density-dependent factor that can regulate population growth?

• A sudden hurricane.

• A widespread disease outbreak.

• A volcanic eruption.

• A prolonged drought.

What was identified as the primary cause for the significant decline in the bald eagle population?

• Habitat loss due to deforestation.

• Illegal hunting by farmers.

• Exposure to the pesticide DDT.

• Increased competition from other predatory birds.