Asked by sharon gordon on May 11, 2024
Verified
Which species would be considered more primitive based upon the structure of their limbs?
A) bats
B) stem reptiles
C) porpoises
D) penguins
E) birds
Primitive
Describing an early or original stage in development, or characteristics that are simple and not derived from anything else.
Structure of Limbs
The anatomical composition and arrangement of bones, muscles, and joints in the extremities of an organism.
- Comprehend the importance of homologous structures and developmental genetics in evidencing evolutionary connections.
Verified Answer
JM
Jessica ManningMay 18, 2024
Final Answer :
B
Explanation :
Stem reptiles are considered more primitive based on the structure of their limbs, as they have a sprawling gait where their limbs stick out to the side. This is the ancestral condition for most land vertebrates, including amphibians and lizards. Bats, porpoises, penguins, and birds have more derived limb structures adapted for flying or swimming.
Learning Objectives
- Comprehend the importance of homologous structures and developmental genetics in evidencing evolutionary connections.