Kelsey Andrews
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Chemistry II
Unit 5 - Counting Particles
Key Characteristics of Phylum
Segmentation
Coelomates
Triploblastic
Bilateral Symmetry
Cephalization
Closed Circulatory System
Chaeta (bristles used for traction, burrowing, or swimming)
How Many Species in Phylum
15,000
Structure and Function
The body of an annelid is divided into segments, separated by septa (internal walls between each segment)
The digestive tract is divided into several parts
Mouth -- Pharynx -- Esophagus -- Crop (stores food) -- Gizzard (grinds food) -- Intestine -- Anus
Closed Circulatory System (blood is contained within the vessels)
Dorsal and Ventral longitudinal vessels, connected by segmental pairs of vessels
There are 5 hearts around the esophagus that pump the blood
Annelids are hermaphrodites but they do not cross-fertilize during sexual reproduction
Two earthworms exchange sperm and store it temporarily
A special organ, the clitellum, secretes a mucous cocoon which slides along the worm, picking up its eggs and the stores sperm
The cocoon slips off the worm into the soil and protects the embryos while the develop
Asexual reproduction can occur in some species by fragmentation followed by regeneration
Nephrindia - specialized structures that excrete waste
Habitat
Annalids are found in oceanic, freshwater, and many other damp soils
Interesting Facts
Annalids are also known as segmented worms
There are around 6,000 species of earthworms alone
60 species of earthworms are actually invasive species, including the night crawler
Home
About
English 8
Learning Targets
Utopia Project
Personal Dictionary Project
Books
Articles of the Week
Extras
English 9
Reading Blog
Writing
Books
English 10
Writing
Reading
Writing Blog
English 11
Reading Blog
Writing Blog
Media
Creative Writing
Journal
Writing Pieces
Poetry
Wildlife Bio
Learning Log
Field Log
Biomes and Ecosystems
>
Tundra
Taiga
Temperate Grassland
Desert
Chaparral
Tropical Rainforest
Savanna
Rivers
Lakes and Ponds
Coastal Ocean
Coral Reefs
Animal Kingdom Phyla
>
Porifera
Cnidaria
Platyhelminthes
Nematoda
Annelinda
Mollusca
Arthropoda
Echinodermata
Chordata
Chemistry II
Unit 5 - Counting Particles