February 12th is Darwin Day, and 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.

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 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