Darwin's Theory

Question 1

Check all statements below that are true.

Revolt · Accepted Answer

A: All organisms must compete for survival.; C: Some organisms have phenotypes that make them better competitors than others in their environment.; E: Natural selection continues to occur even today.; F: Phenotypes found in the most successful members of a species become the most prevalent after several generations.

Question 2

The birds shown above have beaks with three different shapes and sizes. These genetic variations in the beak each appeared initially due to

Revolt · Accepted Answer

B: mutations.

Question 3

Look at the three beaks. Which flock’s birds have beaks that seem most likely to be able to pierce a piece of fruit?

Revolt · Accepted Answer

A: Flock X

Question 4

Suppose that a plant disease kills all the fruit. The change could become a on the birds.

Revolt · Accepted Answer

B: selective pressure

Question 5

Check all correct elements below that you included in your question.

Revolt · Accepted Answer

A: The independent variable is the type of food available.; B: The dependent variable is the frequency of each type of beak (or number of birds with each beak type).

Question 6

Check all possible effects of this selective pressure.

Revolt · Accepted Answer

A: Flock X may try to eat other foods.; B: Flock X could migrate in search of fruit.; C: Flock X could slowly decrease in number.; D: Flocks Y and Z could benefit and increase.

Darwin's Theory Answers

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