A WORMY DISSECTION!
Guzman - PAP Bio - 7. Juan Torres.
Earthworms are heraphrodites, meaning they carry both male and female organs. They are also both invertebrates, but they lack a skeleton. Earthworms are also commonly referred to as "night crawlers" , "dew worm" , "rain worm" , and "angle worm." An earthworm's niche is to improve the soil by means of natural aeration. Earthworms also break down organic waste and excrete nitrogen-rich wastes that is beneficial to the soil.
An earthworm has many adaptations:
- Each segmented portion of an earthworm's body contains a number of bristly hairs called setae, which improves the earthworm's grip as it moves through the soil.
- An earthworm has a streamlined body that enables it to live in narrow burrows and move in the soil effortlessly.
- In order to reach food, an earthworm pushes its pharynx out of its mouth to get the food.
- When the soil is too hot or too dry, an earthworm goes through aestivation, a process that helps the earthworm adapt to sudden environmental changes.
An earthworm's predators include: birds, robins, snakes, chipmunks, moles, rats, and raccoon.
Earthworms are known to live in moist, damp, and dark soil that prevents them from getting dry and going hungry,
Earthworms eat soil that provides nutrition from decaying roots and leaves. They also eat animal manure, and living organisms, such as nematoads, protozoans, and bacteria in the soil.
Maya and I in biology.
My biology classmate Maya and I are in this picture. As depicted, I am holding the earthworm before the dissection actually began while Maya is ridiculously posing in the back.
This is the earthworm we dissected in biology! As you can see, the worm is help open by some pins. This is currently displaying the internal anatomy of the worm!
The external view of the worm!
This picture depicts the external view of the worm before we began dissecting it. Its external parts include the mouth, anus, segments, setae, posterior end, and anterior end.
Maya and I in biology.
The Digestive System
Detailed look at the digestive system of an earthworm.
gizzard, crop, intestine, mouth, esophagus, pharynx.
A look at the digestive system!
- There are about 6,000 species of earthworms in the world.
- Earthworms breath through their skin, as they lack lungs.
- Each earthworm is both male and male, producing both sperm and eggs.
- Earthworms can grow from 1/2 of an inch to 10 feet.
- An earthworm's digestive system runs through its whole body.
- Baby earthworms emerge from tiny eggs but are fully formed.