Concept explainers
To compare: The structure of planarian and earthworm with regard to their: digestive tract, body cavity and the segmentation.
Concept introduction: The Planaria is a flatworm that is included in phylum
The Earthworm is included in phylum Annelida which is the group of animals that are included in the invertebrates. These are the true segmented worms that have flexible body and no hard skeleton is present in their body. They have closed circulatory system, small brain, nervous system and excretory system. They do not have legs. Their body cavity is filled with coelom. Their size range from 1 mm to 3 m. They are found in various habitats like in soil, at the bottom of the ocean or in fresh waters.
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Chapter 18 Solutions
Modified Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Biology: Concepts & Connections (9th Edition)
- Describe the differences in both ingestion and digestion in cnidarians, like jellies, and an earthworm. (Complete vs. incomplete, type of body cavity, structures involved)arrow_forwardWrite “yes” or “no” to indicate how certain features distinguish each phylum of multicellular invertebrates. Tissues Radial Bilateral symmetry Protostome development Deuterostome development Sponges Cnidarians Arthropods Nematodes Flatworms Annelids Mollusks Echinodermsarrow_forwardCompare the anatomical features of roundworms andarthropods.arrow_forward
- State whether the animal is internally segmented, externally segmented, or both. 1. Fish 2. Grasshopper 3. Snake 4. Bird 5. Earthworm 6. Snail 7. Shrimparrow_forwardDifferentiate the head regions of the free-living flatworm, fluke and tapeworm.arrow_forwardWhat is the key difference between the digestive tract of earthworm and a flatworm?arrow_forward
- List and describe the three classes of flatworms.arrow_forwardLongitudinal muscles of roundworms have tissues similar to? Explain. a) cardiac muscle b) skeletal muscle c) smooth musclearrow_forwardCompare the body structures and functions of a flatworm and a cnidarian in terms of MOVEMENT and EXCRETION OF BODYWASTEarrow_forward
- Earthworm Compare the posterior segments to the anterior segments in a earthworm internal featuresarrow_forwardSelect all of the following that are characteristics of crustaceans. maxillary glands. monoecious calcium carbonate deposited in the exoskeleton. two pairs of antennae. antennal glands. a body with three tagmata external fertilization.arrow_forwardDiscuss the role of the cuticle in the earthwormarrow_forward
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