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Speciation occurs when one species splits into two or more different species. This usually happens because they are separated by physical barriers, time of mating and other factors. Which of the following examples demonstrates speciation?
Speciation of organisms can occur due to
Based on the diagram above, how might the beaks of each of these species of birds differ from one another after several generations?
Based on the diagram, how might the mice in location B differ from the mice in location A after several generations?
Which statement provides the best evidence that these organisms share a common ancestor?
Humans, chimpanzees, and gorillas have opposable thumbs for grasping objects. Based on this information, which statement is most likely true?
Scientists hypothesize that onions and celery developed along a common evolutionary pathway. Which of the following would best support this hypothesis?
Why is DNA the most accurate piece of evidence to show relationships between two different species?
According to one theory, similarities in these embryos suggest common ancestry. What will most likely happen as these embryos mature?
How is DNA used to show relationships between species?
The original population of a horse species contains some fast and some slow running horses. The average speed of a horse is 55 mph. How would the running speed of a predator affect the diversity of a horse population and the shape of the graph after several generations.
Which statement best describes the scientific community’s current understanding of natural selection?
Genetic drift is a process that causes
The diagram shows the changes in the foot structure of a horse population over many generations.
How can these changes best be explained?
The gene frequency for a specific trait in a population was determined to be 90% B (dominant allele) and 10% b (recessive allele). 100 years later, the gene frequency was determined to be 60% B and 40% b. What does this change most likely indicate about the gene pool?