Benkman's Experiment with Five Species of Birds of the Crossbill

question 69

Multiple Choice

Benkman's experiment with five species of birds of the crossbill species complex showed that each species' bill morphology had a positive correlation with its preferred pine cone, which also provided the highest survival rate of each bird type. What major conclusion did Benkman make in response to this evidence?

• A) The crossbills' differences are due to past geographical isolation.
• B) The crossbills are currently undergoing evolutionary divergence.
• C) The crossbills that prefer the most common type of cone will eventually outcompete the others.
• D) The crossbills are very flexible in the type of cone they can eat, leading to their success as a species.

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Definitions:

Reproductive System

A collection of internal and external organs in both males and females that work together for the purpose of procreating.

Osteoporosis

A condition characterized by a decrease in bone density and strength, causing bones to become fragile and more likely to fracture.

Estrogen Levels

The concentration of estrogen hormones in the body, which are critical for the development and regulation of the female reproductive system and secondary sexual characteristics.

Osteoporosis

A disease characterized by low bone mass and deterioration of bone tissue, leading to increased bone fragility.