Dendrobium orchid species inhabit the tropical rain forests of South America. Because they have extremely long flower necks with the pollen held deep within them, these orchids can be pollinated only by a single species of moth that has an exceptionally long proboscis. Ten years ago, a scientist studying the orchid recently noticed a few plants with shorter flower necks that were able to be pollinated by more species. He continued studying the flowers and collected the following data:

This data is an example of what?
commensalism
intraspecies competition
mutualism
natural selection

Question

Dendrobium orchid species inhabit the tropical rain forests of South America. Because they have extremely long flower necks with the pollen held deep within them, these orchids can be pollinated only by a single species of moth that has an exceptionally long proboscis. Ten years ago, a scientist studying the orchid recently noticed a few plants with shorter flower necks that were able to be pollinated by more species. He continued studying the flowers and collected the following data:


This data is an example of what? 
commensalism
intraspecies competition
mutualism
natural selection

anonymous · Answer

Percentage of Flower Types

Long-Necked Flowers

Short-Necked Flowers

Year 1

98

2

Year 3

82

18

Year 5

61

39

Year 7

24

76

Year 9

17

83

anonymous · Answer

The data just shows how the decreasment of the long necked flowers to th eincreasing short necked flowers. I think the answer is b