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Chapter 1: Problem 73

Researchers believe that Archaeopteryx differs from modern birds for all of the following reasons EXCEPT: 1\. a lack of feathers. 2\. pectoral muscle development. 3\. ossification of the sternum. 4\. knobs found on the ulna.

Short Answer

Expert verified
The correct answer is: Archaeopteryx differs from modern birds for all of the following reasons EXCEPT: 1. a lack of feathers, as Archaeopteryx did have feathers.

Step by step solution

01

Analyze Option 1

Option 1 states that Archaeopteryx differs from modern birds due to a lack of feathers. However, it is known that Archaeopteryx had feathers. This option could be the exception. We need to explore the other options before making a final conclusion.
02

Analyze Option 2

Option 2 discusses pectoral muscle development as a difference between Archaeopteryx and modern birds. This is indeed true, as Archaeopteryx's pectoral muscles were less developed compared to modern birds, which affects their flying ability. This option is a valid difference.
03

Analyze Option 3

Option 3 points out the ossification of the sternum as a difference between Archaeopteryx and modern birds. This is also true, as modern birds have a fully ossified sternum that provides strength and support for powerful wing muscles, while Archaeopteryx had a partially ossified sternum. This option is a valid difference.
04

Analyze Option 4

Option 4 mentions knobs found on the ulna as a difference between Archaeopteryx and modern birds. This is true as well. Modern birds have knobs on their ulna that serve as attachment points for strong flight muscles, while Archaeopteryx did not have these knobs. This option is a valid difference.
05

Determine the Exception

After analyzing all four options, we can conclude that Option 1 (a lack of feathers) is the exception. Archaeopteryx did have feathers, so this reason is not a valid difference between Archaeopteryx and modern birds. So, the correct answer is: Archaeopteryx differs from modern birds for all of the following reasons EXCEPT: 1. a lack of feathers.

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