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Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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4

Use the drop-down menus to complete the statements about the birds. 

 

The changed environment selected 
​
​
 
  • For
  • Against
 the birds with smaller beaks. The population of birds with smaller beaks 
​
​
 
  • increased
  • decreased
 because of an 
​
​
 
  • increase
  • decrease
 in competition over small seeds. 
Bird Beak Variation Bird beak size is often related to the type of food the bird eats and the size of the food source. Some birds eat seeds as food. Birds with large beaks are better able to eat larger seeds, while birds with small beaks typically eat smaller seeds. An environmental change occurred that resulted in a reduction in one type of food, namely small seeds. The change caused a shift in the distribution of beak sizes observed. The graph shows the distribution of birds of various beak sizes before and after the change. original population Percentage of Population Small population after environmental change Medium Beak Size Large
Transcribed Image Text:Bird Beak Variation Bird beak size is often related to the type of food the bird eats and the size of the food source. Some birds eat seeds as food. Birds with large beaks are better able to eat larger seeds, while birds with small beaks typically eat smaller seeds. An environmental change occurred that resulted in a reduction in one type of food, namely small seeds. The change caused a shift in the distribution of beak sizes observed. The graph shows the distribution of birds of various beak sizes before and after the change. original population Percentage of Population Small population after environmental change Medium Beak Size Large
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