A population of bats is found on an island.  A detailed study of the bats reveals that the average wing length has not changed over many generations.  Bats with longer wings are often blown out to sea in wind storms while bats with shorter wings are not as good at catching insects.  Average length winged bats live the longest and have the most offspring.  What evolutionary force is acting here? Group of answer choices a. migration b. directional (natural) selection c. stabilizing (natural) selection d. drift

Whale Body Shape Phenotypes in Decreasing water Temperature: Population after selection Original population Small Body- -Large Body 1.) Which statement from a scientist would best explain why the whale species changed? a. Whale body size increased since colder waters meant whales no longer needed as high of a surface area to volume, the ability to remain in colder water lead to reproductive isolation from the whales that immigrated to warmer waters. b. Whale body size increased since colder waters meant whales no longer needed as low of a surface area to volume. the ability to remain in colder water lead to reproductive isolation from the whales that immigrated to warmer waters. c. Whale body size decreased since colder waters meant whales no longer needed as high of a surface area to volume, the ability to remain in colder water lead to reproductive isolation from the whales that immigrated to warmer waters. d. Whale body size decreased since colder waters meant whales no longer…

Which of the following is true regarding vestigial traits?   A. Vestigial traits are evidence for change over time   B. Vestigial traits are evidence for common ancestry   C. Vestigial traits indicate that not evolution does not perfect organisms   A and B   A, B, and C

Which evolutionary mechanism is most problematic for endangered species? A. natural selection  b. gene flow c. sexual selection  d. Hardy- Weinburg  e. genectric drift due to founder effect

The male bower bird builds an elaborate structure (a bower) of sticks and other objects.  He then displays to females in front of the bower.  The bower building behavior is probably the result of ... ? Group of answer choices a. intrasexual selection b. migration c. natural selection d. intersexual selection e. genetic drift

A polar bear is leaving the ice caps because they are melting. The polar bear enters a wooded area with limited snow. Describe how natural selection would affect the polar bear's relationship with its ecological surroundings.

The main idea behind Darwin’s theory of natural selection was Group of answer choices a. Competition for space between the individuals will limit a population b. Individuals pass on acquired characteristics to their offspring c. Individuals with advantageous adaptations are more likely to out-produce those lacking that adaptation d. Populations adapt over time

Which of the following is NOT a correct statement regarding the neutral-mutation explanation for the high levels of genetic variation? A. Most genetic variation observed is adaptively neutral. B. Natural selection plays a lesser role in maintaining genetic variation. C. When natural selection occurs it leads to a decrease in genetic variation. D. Genetic variation is maintained mainly via the random effects of genetic drift.

Cana a change in the physical enviroment of a population result in evolution by natural slection?(hint: remember the peppered moth's camouflage and color changes of tree bark due to pollution)

If hybrids are less successful than individuals of either parent species which of the following is most likely to occur? Group of answer choices A. fusion B. mutation C. reinforcement D. frequency dependent selection