Which of the following would result in allopatric speciation by dispersal? A. A river separating a previously contiguous population of salamanders B. A receding water table separating a population of frogs into two separate wetlands C. Finches colonizing an island exposed by water level changes in a reservoir D. A population of trees being split in two by an advancing glacier

Which of the following is an example of sympatric speciation? Group of answer choices a. birds moving to the far side of a mountain range b. squirrel populations on opposite sides of the Grand Canyon c. insects moving to new host plant species d. fish in two different lakes

In which of the situations below would speciation be most likely to occur? You can choose more than one answer. a. Seven lemurs escape from an enclosure at Duke University. To everyone's surprise, they establish a small but viable population coexisting successfully with humans in a partly suburban environment very different from their native Madagascan habitat. b. Bighorn sheep occupy mountains from Canada to Death Valley in Southern California, interbreeding all along the way. The populations at the two ends of the range live in very different environments. c. A few individuals of a butterfly species were blown to an island during a severe storm. d. A population of juniper shrubs is split by the formation of a canyon. Every year, strong winds carry a small amount of the shrubs' pollen across the canyon.

Which of the following is a characteristic of species found on oceanic islands? Group of answer choices A. they are often found nowhere else but are close relatives of species on continents B. they are widespread species found over most of the earth C.they are very large and not able to swim D. they are completely unique and not closely related to other species elsewhere

Of the trees in the diagram below, which one of the four trees depicts a different evolutionary history than the others? A. Tree a. B. Tree b. C. Tree c. D. Tree d.

25. Which letter indicates the most recent common ancestor between Tsavo and Zambia? a. A d. D b. B е. Е С. C 26. Which two species populations do you think are most related? a. Fannie Roberts and Umfolozi b. Sabi Sands and Zambia С. Umfolozi and Tiger

What does the circled part of the phylogenetic tree below indicate? Select one: A. An adaptive radiation B. A mass extinction event C. Rapid speciation D. A and/or C E. all of the above

The Galapagos archipelago consists of volcanic islands that formed within the last 5 million years. Darwin wrote of the finches on these islands, "...from an original paucity of birds in this archipelago, one species has been taken and modified for different ends." The Galapagos finches are an example of adaptive radiation driven by a. behavioural innovation. b. morphological innovation. c. ecological opportunity. d. physiological innovation.