AnswersDCSS Biology CR 24-25Cumulative Exam

Cumulative Exam — Cumulative exam Answers

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A farmer has applied a pesticide to control a pest population that is affecting her crops. The pest population has reacted as shown below.Which best describes the process that the pest population has experienced due to this environmental change?

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A
genetic diversity
B
natural selection
C
natural resistance
D
gene flow
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Which element is most important for adding strength to hair, feathers, and outer skin?

A
oxygen
B
hydrogen
C
sulfur
D
phosphorus
44

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. There has been much debate about the classification of these creatures. Some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. The data equally support both cases.Which statement best explains how to draw a cladogram that includes the rynchosaur?

Question illustration
A
Draw the cladogram for amphibians.
B
Draw the cladogram for reptiles.
C
Draw two cladograms, both showing the traits, and leave it as a hypothesis.
D
Draw two cladograms, both showing the traits, and have scientists vote.
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Which of the following examples can cause gene flow between populations?

A
an increase in predators to a population of zebra
B
a volcanic eruption that kills half of a population of mice
C
bird droppings that contain seeds from a different location
D
a person that sprays a toxin on a group of mosquitoes

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