Phylum Annelida
segmented worms- earthworms, sea worms, leeches
Phylum Annelida refers to a diverse group of segmented worms that includes earthworms, leeches, and marine worms. Here are some important characteristics and facts about Phylum Annelida:
1. Segmentation: These worms have a segmented body with a series of repeated units called metameres. This allows for greater flexibility and better movement.
2. Cross-walls: Each segment is separated from the next by a cross-wall called a septum. These septa help prevent the spread of infection and damage to the other segments in the event of injury.
3. Coelom: Annelids have a true coelom, which is a fluid-filled body cavity that surrounds and cushions the internal organs.
4. Circulatory System: Annelids have a closed circulatory system that is made up of blood vessels. The blood carries oxygen and nutrients to the tissues and cells.
5. Respiratory System: Depending on the type of worm, the respiratory system may vary. Earthworms breathe through their skin, while marine worms have gills.
6. Reproduction: Annelids can reproduce asexually or sexually. The reproductive organs are located in the segments near the front and back of the worm.
7. Habitat: Annelids can be found in a variety of environments, such as soil, freshwater, and marine ecosystems. Earthworms play an important role in the ecosystem by breaking down organic matter and improving soil structure.
Overall, Phylum Annelida is a diverse and complex group of worms that play important roles in the environment and have unique adaptations for their respective habitats.
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