Biology Chapter 15-2

Biology Chapter 15-2 - is not contained entirely within...

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Chapter15 Section 2 - Mollusks and Annelid Worms Mollusks invertebrate with a circulatory system and a gut. Three classes: gastropods - slugs and snails bivalves - clams and other shellfish cephalopods - squids and octopuses How do Mollusks Eat? gastropods - eat with a ribbonlike organ - a tongue covered with curved teeth called a radula . They use the radula to scrape algae from rocks or pieces of leaves from plants. Clams and oysters attach to one place and use gills to filter tiny plants, bacteria, and other particles from the water. Octopuses and squids use tentacles to grab their food and to place it in their powerful jaws. Annelid Worms Often called segmented worms because their bodies have segments. segment - identical (or almost) repeating body part. Annelids are more complex than other worms. They have a closed circulatory system. 1
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open circulatory system  - a circulatory system in which the circulatory fluid 
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Unformatted text preview: is not contained entirely within vessels. closed circulatory system - a circulatory system in which the heart circulates blood through a network of blood vessels that form a closed loop. Three major groups of annelid worms are earthworms, marine worms, and leeches. Earthworms - most familiar worms. They eat materials in the soil. Their waste, called castings , make the soil richer for plants to grow. The digging also helps to loosen the soil to allow air and water to the roots of plants. Marine Worms covered with bristles comes in many colors - very pretty most live in the ocean They eat mollusks and other small animals. Leeches Three types: parasites that suck other animals blood scavengers that eat dead other animals predators that eat insects, slugs, and snails. Doctors sometimes use leeches to prevent swelling near a wound. 2...
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Biology Chapter 15-2 - is not contained entirely within...

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