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The Common Descent Podcast

Episode 241 - Digestion

The Common Descent Podcast

Common Descent

Science, Natural Sciences, Education, Earth Sciences, Science:natural Sciences

4.8764 Ratings

🗓️ 12 April 2026

⏱️ 140 minutes

🧾️ Download transcript

Summary

The world is full of food, but in order to make the most of it, living organisms need to be able to break it down and extract the useful nutrients. This episode, we explore the fundamental process of digestion and the many, many ways that life has adapted this process to various diets. And we’ll take a look at what the fossil record has to tell us about ancient diets and the evolutionary history of digestive systems. In the news: predator bites, coelacanth lungs, Cambrian claws, and squid evolution. Time markers:Intro & Announcements: 00:00:00News: 00:05:55Main discussion, Part 1: 00:38:10Main discussion, Part 2: 01:23:30Patron question: 02:06:50 Check out our website for this episode’s blog post and more: http://commondescentpodcast.com/ Join us on Patreon to support the podcast and enjoy bonus content: https://www.patreon.com/commondescentpodcast Got a topic you want to hear about? Submit your episode request here: https://commondescentpodcast.com/request-a-topic/ Lots more ways to connect with us: https://linktr.ee/common_descent The Intro and Outro music is “On the Origin of Species” by Protodome. More music like this at http://ocremix.org Musical Interludes are "Professor Umlaut" by Kevin MacLeod (incompetech.com). Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0

Transcript

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0:00.0

You're listening to the Common Descent Podcast.

0:19.0

Hello, David. Hello, Will.

0:21.9

And hello, listeners.

0:23.5

Welcome to episode 241 of the Common Descent Podcast, where we like to discuss all sorts of cool natural science and paleontological topics.

0:35.1

Today, we're discussing a very relatable one, digestion.

0:40.3

I do it all the time. I'm doing it right now. Yep. In this topic, we will be discussing what

0:46.2

digestion is, the different steps, the different organs that are involved, some of the diversity,

0:52.7

some, some of the diversity, as well as how we're

0:56.8

able to study it in the fossil record. Digestion is a very cool concept that we will get a glimpse

1:03.6

into the many, many ways organisms get nutrients. Yeah, this is one of those topics that is fun because you start out with a very personal

1:13.3

understanding, a very relatable understanding.

1:15.7

Yes, this is how my body does it.

1:17.7

And then you can spiral off into all of the fun directions of, well, here's how everybody

1:22.4

else does it.

1:23.3

Here's a bunch of ways it can vary.

1:25.3

Here are the details you might not be familiar with. Here are the definitions. It's one of those very fun topics. There's a lot of depth to this subject. One of my favorite moments that comes up in these sorts of episodes is the, oh, yeah, I guess that does count. And I love, I love when we get to have one of those. You go, oh, right, yeah. I guess that is part of the list.

1:45.9

And yeah, there's a whole bunch of those for digestion.

1:48.5

By the end of this episode, you'll be able to feel your intestines working.

1:54.4

This episode, as all our episodes are, was requested by a bunch of lovely people, including Alex, Aaron, Big Boss Man,

2:05.3

Cerk, Nina, Sylvie, Luke, Taterboy, Catherine, and Cheryl. Thank you, everybody, for this

2:13.3

request. Absolutely. Hope you all enjoy. Before we get into the topic, we have some announcements

2:20.8

and then our first section. Our first announcement, as always, is that we have a Patreon.

...

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