The Dirt on Decomposers: Crash Course Kids #7.2 - By Crash Course Kids
Transcript
| 00:09 | Have you ever had to take out the garbage kind | |
| 00:11 | of gross , Right ? But someone's got to do | |
| 00:13 | it . And we're not the only things that make | |
| 00:15 | waste , trees drop their leaves and animals drop well | |
| 00:18 | , other stuff . So what happens to all that | |
| 00:20 | waste that's created in nature ? It turns out that | |
| 00:26 | waste as gross as it may seem is actually a | |
| 00:29 | good source of energy for lots of different living things | |
| 00:31 | like bacteria , some fungi , insects and worms . | |
| 00:34 | These organisms called D . Composers break down waste and | |
| 00:38 | the remains of dead plants and animals to get energy | |
| 00:40 | , which is a bonus for the rest of us | |
| 00:41 | because thanks to D composers , there's a lot less | |
| 00:44 | waste than dead stuff lying around . Now . If | |
| 00:46 | you've been paying attention so far in our little talks | |
| 00:48 | here , you'll remember that all living things need energy | |
| 00:51 | to survive and energy flows through a system of living | |
| 00:54 | things moving from plant to animal to other animals . | |
| 00:57 | In a what eats what model called a food chain | |
| 00:59 | , we use food chains to see how energy flows | |
| 01:02 | between living things in an ecosystem . So D composers | |
| 01:05 | are living things too . And since they need energy | |
| 01:07 | to live just like anybody else , they need a | |
| 01:09 | spot in the food chain . But where do D | |
| 01:11 | composers fit in an ecosystem's food chain ? Let's take | |
| 01:13 | a look at a simple little ecosystem to see where | |
| 01:16 | they might find a home . Mhm mm . Plants | |
| 01:21 | like this apple tree are able to grab the energy | |
| 01:23 | that comes from the sun . They use this energy | |
| 01:25 | to take water nutrients and a little bit of gas | |
| 01:27 | from the air to create chemical energy . The tree | |
| 01:30 | Stashes some of that energy in its fruit , which | |
| 01:32 | happens to be delicious . If an apple from that | |
| 01:35 | tree falls to the ground and gets nibbled on by | |
| 01:37 | a mouse , some of the energy from the apple | |
| 01:39 | is going to be transferred to the mouse . And | |
| 01:41 | if the mouse is unfortunate enough to be spotted by | |
| 01:43 | an owl , it's going to end up as an | |
| 01:45 | owl brunch and the energy from that mouse will be | |
| 01:48 | transferred to the owl . Apple mouse owl . That's | |
| 01:51 | a simple enough food chain . Right ? Everyone has | |
| 01:53 | their place in it . The system works , but | |
| 01:55 | d composers can live and work in more than one | |
| 01:57 | spot in this food chain . They can show up | |
| 01:59 | any time . There's waste to break down like the | |
| 02:01 | leftover apple that the mouse didn't eat , or the | |
| 02:04 | apples dropping . See composers break those things down into | |
| 02:07 | smaller parts , like nutrients and other chemicals . These | |
| 02:10 | chemicals go into the ground and are taken up by | |
| 02:12 | plants so they can use them to make more energy | |
| 02:15 | . And the process starts all over again , not | |
| 02:17 | to get a lion king on you . But I'm | |
| 02:19 | thinking that this really closes up the circle of life | |
| 02:22 | , right ? And since we're talking about circles and | |
| 02:24 | cycles , let's recycle some of these ideas . One | |
| 02:26 | last time D composers break down waste in an ecosystem | |
| 02:33 | into nutrients in plants , use those nutrients to make | |
| 02:36 | energy and that energy goes up the food chain all | |
| 02:39 | over again . And like I mentioned before , D | |
| 02:41 | composers don't just put energy back into the food chain | |
| 02:44 | . They also keep waste from piling up in an | |
| 02:46 | ecosystem . So while we might kind of forget that | |
| 02:48 | insects or worms or fungi are there , remember that | |
| 02:52 | we need them to clean up waste , losing the | |
| 02:54 | decomposes in a food chain would completely mess up the | |
| 02:58 | nice balance that all living things have going on , | |
| 03:00 | which , okay , yes , I guess means that | |
| 03:02 | I'll finally clean up my desk until next time . |
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