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Which of these is MOST LIKELY caused the difference in fur color between polar bears and brown bears?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Which is a condition required for natural selection to occur in birds?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Which of the following factors is necessary in order for natural selection to occur in a species?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Which geological process is most important in supporting the theory of evolution?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Which of the following statements best describes the process of evolution?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
What idea did Darwin propose about why Galapagos Island finches beaks were different?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Modern horses developed their traits through natural selection. What occurs during the process of natural selection?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
Darwin stated that we could never watch natural selection in action. Why did Darwin believe this?
genetic variation within a population
The characteristics of a species can change over time.
Natural selection occurs over so many generations, it is impossible to see changes occur.
Polar bears benefited from lighter colored fur and passed it on to their offspring.
formation of sedimentary rock
Only the fittest organisms survive and reproduce.
Species must produce more offspring than can survive.
The beaks of the finches are adapted to the way the bird usually gets food.
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