After reading the paragraphs below, answer the question(s) that follow(s).
The first fossil of Archaeopteryx, which lived about 150 million years ago, was found in the Solnhofen Quarry in Germany. Archaeopteryx has an interesting collection of characteristics that led to the hypothesis that it represented an evolutionary transition between modern-day birds and small bipedal dinosaurs. The fossil reveals the imprint of feathers, which connect Archaeopteryx to birds, although they don't present direct evidence of flight.
Unlike birds, however, the fossil record reveals that Archaeopteryx had teeth, functional claws on the wings that may have been used for climbing trees or holding prey, and a long, bony tail. Birds have a fused collarbone, and this was found in Archaeopteryx also. However, there were differences in the structure of the sternum. In birds, the sternum is keeled (raised and slightly concave). The keel of the sternum serves as an attachment site for the flight muscles. Archaeopteryx had a flat sternum, similar to that found in reptiles.
-The absence of a keeled sternum in Archaeopteryx suggests that this species
A) could not fly.
B) could not fly as well as most modern birds.
C) could not run.
D) could not take off from the ground.

Question

Quizplus · Accepted Answer

The absence of a keeled sternum in Archaeopteryx, which serves as an attachment site for flight muscles in birds, suggests that it could not fly as well as most modern birds, rather than being completely incapable of flight.

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