November 24th is Evolution Day, which celebrates the publication of On the Origin of Species by Charles Darwin in 1859. Darwin’s theory of evolution is one of the central concepts in biology.

Experiments in comparative physiology are an excellent way to teach concepts in evolutionary biology. The Vernier Biology Department developed an experiment that investigates the comparative physiology of snails and fish.

Graph of comparing the respiration rates of fish and snails.
A comparison of the respiration rates of fish and snails

In this activity, students measure the respiration rate of an aquatic snail, a goldfish (Carassius auratus), and a Betta (Betta splendens) using a small respiration chamber and an Vernier Optical DO Probe or Go Direct® Optical Dissolved Oxygen Probe. Get the experiment overview and download for “Evolution of Aquatic Respiratory Systems.”

Evolution-related Activities from Investigating Biology through Inquiry

Other Evolution-related Activities