1. Introduction to Biology

What is one example of biological variation that Darwin observed during his travels?

Which of the following scenarios would make it least likely for plants in grasslands to benefit from adaptations that protect against grazing?

How are primary and secondary succession similar in the context of ecological succession?

Which of the following best describes our current understanding of how species evolve over time?

Why do scientists use comparisons between fossils and existing species to classify organisms?

The evolution of hummingbirds' beaks and plants with deep tubes in their flowers is an example of:

Organisms that share a common ancestor often show similarities in their early:

Which type of biodiversity helps a species adapt to changing environmental conditions?

Which term describes structures in different species that are similar because of common ancestry?

Which type of natural selection favors average individuals in a population?

Which of the following is an example of an adaptation?

Which of the following is NOT one of the 'five fingers' of evolution that can cause changes in allele frequencies within a population?

Natural selection that changes the distribution of a trait to favor one extreme phenotype is called:

Which of the following is a possible outcome of natural selection?

Which of the following is an example of natural selection in a population?