You are a teaching assistant for an introductory biology laboratory. You would l

Question

You are a teaching assistant for an introductory biology laboratory. You would like your students to see connections between admittedly very different looking and functioning creatures that make up the major groups of vertebrates. What structures could you point to in the bony fish that have connections in the evolutionary framework to higher vertebrates?

teeth arose from the rough scales of ancestral sharks

skeletal developments leading to the amphibian movement onto land probably evolved in from lobe-finned fishes

fish fins are ancestral (homologous) structures to the wings of birds

the swim bladder ultimately led to the evolution of the amphibian urinary bladder

Explanation / Answer

skeletal development leading to amphibians movement onto land probably evolved from lobe finned fishes

this will show that organism first evolve into water then slowly move onto the land and finally evolvd as species of land.

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