Facts On Earthworms -Erica Chen
Vu - PreAP Biology - April 6, 2014 - Period 3
- Setae are bristly hairs that provides grip to help earthworm move through soil
- Earthworm's streamlined body with no antennae, fin, arms or legs helps them live in narrow burrows underground and makes moving easier
- Earthworm has circular muscle that surround each body segment. It also has longitudinal muscles that run the lengths of its body. Those muscle also helps with movement.
- Mucus or coelomic fluid helps them move smoothly through soil
- When environmental condition is not favorable, earthworms can become inactive in a process called aestivation
- Earthworms react to vibration. When they feel predator, they will move away.
- Earthworms are sensitive toward light and are usually seen on soil surface at night
- Earthworms lose moisture through their skin so they move out of their burrow to migrate and reproduce when the ground is wet with dew. This is one reason why they can be seen in the early morning.
Evolutionary History and Relationships
Digestive System Interaction
The food digested is then directed to the excretory system which gets rid of waste from the food.
Nutrients in the food is then transport, using the circulatory system, to areas that needs energy.
Earthworms need strength, from the muscular system, to swallow and digest food.
Interesting Fun Facts
A worm has no arms, legs or eyes.
There are approximately 2,700 different kinds of worms
In one acre of land, there can be more than a million earthworms
The largest earthworm ever found was in South Africa and was measured 22 feet.
Charles Darwin spent 39 years studying earthworms
Worms are cold-blooded animals
Earthworms have the ability to replace or replicate lost segments.
Baby worms hatch from cocoons smaller than a grain of rice
Even though worms don't have eyes, they can sense light
If a worm's skin dries out, it will die
Worms are hermaphrodites. Each worm has both male and female organs.
Worms can eat their weight each day