To The Ground and Beyond-Earthworms
Elizabeth Tyska-Vu-7th Period Pre-Ap Biology
Objectives From the GROUND Up
The soil they feed on is excreted though their anus back into the environment. Earthworms are very dependent on the attributes of the ecology of the soil they are in. if it is too acidic, or there is not enough nutrients, they will die. The outside of the worm is covered in annuli, which have tiny hairs, called setae, on them that help the worm move through the soil. Earthworms also aerate the soil by moving through it, and provide many vital nutrients to the environment. This is very useful to farmers, who have been known to buy earthworms to improve their soil quality and fertility.
Earthworms have adapted a lot since they first evolved. They do not have eyes or ears, but they are very sensitive to heat, light, and touch. This helps protect them during summer, so they don't dehydrate, and winter, so they don't freeze.
For more information and interesting facts about earthworms, visit the site below.
GROUNDbreaking Digestive System
For a video of food moving through the digestive system of a worm, see below. After that, you'll find pictures of the internal and external anatomies, along witha viua of the digestive system.
- "Worm Facts." Worm Facts. N.p., n.d. Web. 05 Apr. 2014.
- "Earthworm Dissection." Earthworm Dissection. N.p., n.d. Web. 07 Apr. 2014.
- "Common Earthworm." National Geographic. National Geographic, n.d. Web. 07 Apr. 2014.
- "Earthworm and Adaptation." Information On Earthworms. N.p., n.d. Web. 07 Apr. 2014.
- "Some Major Parts of The Earthworm Digestive System." Science Project. N.p., n.d. Web. 07 Apr. 2014.
- The Digestive System of an Advanced Worm. Dir. Peter Cook. Perf. Worm. Youtube. Peter Cook, n.d. Web. 7 Apr. 2014. <https://www.youtube.com/watch?v=hyr3d8e99sY>.
- "Earthworms." Earthworms. N.p., n.d. Web. 07 Apr. 2014. <http://www.sas.upenn.edu/~rlenet/Earthworms.html>.