Which Was an Early Tetrapod Innovation

question 78

Multiple Choice

Which was an early tetrapod innovation?

• A) limbs evolved from dorsal fins
• B) cartilaginous pectoral girdle
• C) four-chambered heart
• D) stereoscopic vision
• E) inner ear changes to detect airborne sounds

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Definitions:

Testes

Male reproductive organs that produce sperm and hormones, including testosterone.

Spermatozoa

Male gametes or reproductive cells that carry a man's DNA to the female ovum in sexual reproduction.

Seminiferous Tubules

Coiled structures in the testes where sperm production occurs.

Islets of Langerhans

Clusters of cells in the pancreas that secrete insulin, glucagon, and somatostatin, crucial for blood sugar regulation.