Evolution

DDT was once used throughout the world as an insecticide to kill mosquitoes. Its regular use initially brought down the mosquito count but later resulted in a population of mosquitoes that was resistant to DDT. Which reason best explains the ineffectiveness of DDT in controlling the mosquito population? 

• Mosquitoes evolved biochemical mechanisms in their bodies to make DDT ineffective. 
• B Mosquitoes that were naturally resistant to DDT lived and produced resistant offspring. 
• C Mosquitoes mutated which made them resistant to DDT. 
• D Mosquitoes adapted to the presence of DDT in the environment. 

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Which two organisms are most closely related according to the classification key? 

• Sea Cucumber and Mandrill 
• Sea Cucumber and Cape Elephant Shrew 
• Mandrill and Ring‐tailed Lemur 
• Cape Elephant Shrew and Ring‐Tailed Lemur 

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Which observation accurately explains the similarities between the organisms? 

• The embryos of all multicellular organisms have distinct similarities early in development.
  
• Embryonic similarities in organisms may suggest they evolved from a common ancestor.
  
• Organisms that have similar characteristics as adults also have similar characteristics as embryos. 
• Embryonic similarities are more common in organisms lacking homologous structures. 

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The anole lizard is bright green in color and is usually found in warm, humid climates. The male lizard puffs out the red flap under its skin and bobs its head up and down when it sees a female.

• The embryos of all multicellular organisms have distinct similarities early in development. Embryonic similarities in organisms may suggest they evolved from a common ancestor. courtship behavior 
• mutualistic relationship 
• predatory mechanisms 
•  territorial defense 

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Which method provides the most accurate evidence for scientists to use when determining evolutionary relationships between two species of animals? 

• comparing genetic sequences in the animals using samples of DNA
  
• dentifying fossil patterns in rock strata where the animals live
  
• ooking for similar vestigial structures in both species of animals
  
• looking for similarities in the coloration and eating habits of the animals 

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Observe the anatomy of a whale’s tail.
Notice the whale has a pelvis and a femur from a leg. What does this evidence suggest? 

• The pelvis helps the whale with its mobility. 
• The whale’s ancestors lived on land. 
• The pelvis has a homologous structure. 
• The whale’s ancestors always lived underwater. 

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In an experiment, a dog was made to salivate when it heard the ringing of a bell. Which type of learning is demonstrated by the dog?

• imprinting
• habituation
• conditioning
• trial and error

A researcher in the Amazon jungle recently found an unknown species of fern. She compared it to four known fern species that grow in the same area. Her results are shown in the table. 
The unknown species is most similar to which known species? 

• species 1
• species 2
• species 3
• species 4

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Of the following, Felis leo is most closely related to 

• Felis domesticus 
• Homo sapiens 
• Xenopous laevis 
• Rana pipiens 

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Which species relationship is represented when a hawk eats the snake it has caught? 

• herbivore/carnivore 
• herbivore/omnivore 
• predator/parasite 
• predator/prey 

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