Keystone Biology Evolution

During a class discussion, Khalila asked about the importance of certain species in maintaining the balance of an ecosystem. What is the role of keystone species in an ecosystem?

• They are the most abundant species in the ecosystem

• They have a disproportionately large impact on their environment

• They are the primary producers in the ecosystem

• They are the top predators in the ecosystem

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During a class discussion, Alex and Salyse were talking about the role of native species like the Florida Panther in Florida's ecosystems. What effect do these native species have on the population of herbivores?

• Increase the number of herbivores

• Control and reduce the population of herbivores

• Have no impact on herbivore populations

• Cause herbivores to migrate to other areas

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Amelia and Joel are studying the impact of the Burmese Python on the populations of small mammals in the Everglades. What have they observed?

• Increased the diversity of small mammals

• Decreased the populations of small mammals

• Had no effect on small mammal populations

• Helped small mammals thrive

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During a biology class, Mark and Amelia were discussing how mutations affect the formation of new species. What role do mutations play in the process of speciation?

• They eliminate genetic diversity

• They introduce new genetic variations

• They prevent species from adapting

• They always lead to extinction

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The theory that organisms have slowly changed over time...

• fossil record

• relative dating

• evolution

• adaptation

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Evolution is the widely held notion that all life is related and has descended from a common ancestor: the birds and the bananas, the fishes and the flowers
 -- all related That is, complex creatures evolve from more simplistic ancestors naturally over time.

• Fact

• Theory

• Law

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What is Evolution?

• The change of climate over time

• The change of genetic information of a population over time

• The change of geological formations over time

• The change of technology over time

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The theory of evolution states that

• species change over time, sometimes developing into new species

• species that are extinct have no biological relationship to living species

• the environment of Earth is constant over time

• different animal species always interbreed to form new and different species

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What is evolution?

• A process by which species of organisms arise from earlier life forms and undergo change over time.

• A theory that explains the origin of the universe

• A process by which organisms develop immunity to diseases

• A theory that explains the behavior of atoms and molecules

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How can high genetic variability within a population impact its ability to survive environmental changes?

• It makes the population more vulnerable to diseases

• It decreases the population's adaptability

• It increases the likelihood of survival and adaptation

• It reduces the chances of new mutations

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