- Students will be able to describe the external anatomy of worms.
Tools & Materials
- Red wigglers
As a kid, a worm was a worm and it’s unlikely any of us really thought about the different species. Of course, there are numerous species involved in the food production process and each is anatomically suited to perform its given function.
But what makes one worm better at digging down into the soil than the next? To answer that question, we must consider the physical characteristics.
Compare the external anatomy of a red wiggler which lives closer to the surface to that of a nightcrawler which resides deeper in the soil. Nightcrawlers can often be found on the surface at night following a rain. You might prepare for this lesson in advance by planning it around a forecast that calls for rain.
Are there any anatomical advantages that allow the nightcrawler to dig deeper? Analyze both species under the microscope and see if you can spot any external differences.
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