Homologous Forelimbs Across Species
PTE CoreSpeakingDescribe ImageItem #16
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Process Diagram

Homologous Forelimbs Across Species

Prep: 25s
Record: 40s
Look at the image below. In 25 seconds, please speak into the microphone and describe in detail what the image is showing. You will have 40 seconds to give your response.
Anatomical diagram comparing the skeletal structures of four homologous forelimbs — human arm, seal limb/flipper, bird wing, and bat wing — color-coded by bone groups: humerus, radius and ulna, carpals, and phalanges.

Sample Answer & Key Features

Review official key features and a band-9 reference response

Key Points to Include in Your Description:
  • 1Compares skeletal structures of four forelimbs: human arm, seal limb, bird wing, and bat wing.
  • 2All four share a homologous bone arrangement: humerus, radius, ulna, and wrist/finger bones.
  • 3Color-coded sections highlight homologous structural similarities.
  • 4Variations in bone length and thickness reflect adaptations for manipulation, swimming, and flight.
  • 5Demonstrates shared evolutionary lineage through homologous anatomical structures.