Ancient fossils that seem to be an intermediate stage in the evolution from fish to tetrapods had which of the following characteristics?
A) fins and scales like a fish but ribs to support the body and a bone structure in the front limb like tetrapods
B) a pelvis and rear limbs like a fish and gills like a tetrapod
C) bones that allowed the head to move like a fish and both gills and lung like a tetrapod
D) scales and a tail like a fish and a simple bone arrangement in the back limb like a tetrapod

Question

Quizplus · Accepted Answer

CAncient fossils that represent an intermediate stage in the evolution from fish to tetrapods often exhibit characteristics that are a mix of both groups. Choice A is correct because it describes features such as fins and scales typical of fish, but also ribs to support the body on land and a bone structure in the front limb like that of tetrapods, which are adaptations for a more terrestrial lifestyle. Choice C is also correct because it mentions the ability of the head to move like in fish, which is important for aquatic life, and the presence of both gills and lungs, indicating a transition towards breathing air, a characteristic of tetrapods. These features are indicative of organisms that were adapting to life both in water and on land, bridging the gap between fully aquatic fish and fully terrestrial tetrapods.

Ancient Fossils That Seem to Be an Intermediate Stage in the Evolution