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Biology 11 25.4 – Phylum Annelida Body Structure of Segmented Worms Annelids undergo _________________ development. Include earthworms, marine worms, and parasitic leeches __________ and have a _____________ Rigidity in annelid segments creates a _______________ skeleton that muscles can push against. Segmentation also permits segments to move ____________ of each other and enables a worm to survive damage. Segments can be _____________. Feeding and Digestion Running through all earthworm ___________ from the mouth to the anus is the digestive tract. Circulation Most annelids have a ___________ circulatory system. Respiration and Excretion Earthworms take in oxygen and give off carbon dioxide through their __________ skin. Aquatic annelids have __________ for the exchange of gases in the water. Segmented worms have two _____________ in almost every segment. Response to Stimuli The ___________ segments are modified for __________ the environment. Movement The earthworm contracts ___________ muscles running around each segment. This ____________ the segment and causes the fluid in the coelom to press ____________like paste. The fluid pressure causes the segment to get _________ and ______________. Biology 11 The earthworm contracts the ___________ muscles that run the length of its body. This causes the segment to _____________ and return to its original shape, pulling its posterior end _______________ and resulting in movement. Reproduction Reproduce both ___________ and ____________ Sperm are passed between two worms near segments called the _____________. The clitellum produces a ____________from which the young earthworms hatch Diversity of Annelids Annelida Typically live underground in _______________ habitats. ___________ the soil as they feed off of it. Earthworms and their relatives Polychaeta Typically live in ______________ environments Bodies have _____________ for swimming and crawling Filter feeders who trap food in ___________on their bodies. Hirudinea Typically live in ___________environments Most are ______________ Leeches have adapted chemicals to stop _____________ of blood.