SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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tissues
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specialized cells
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an organ system
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all of the above
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Detailed explanation-1: -The digestive system consists of the pharynx, the esophagus, the crop, the intestine and the gizzard.
Detailed explanation-2: -The digestive system begins at the mouth, continues through a pharynx and tubular esophagus to the bulb-like crop and tough-walled gizzard behind it; the intestine extends from the gizzard posteriorly to the anus at the tip of the worm. The space in each segment around the digestive system is part of the coelom.
Detailed explanation-3: -Segmented worms have several body organs and systems. They have five paired organs that act like hearts to pump their blood through large blood vessels. They have a brain and nerve cord. They have reproductive organs and waste-removal organs.
Detailed explanation-4: -Gizzard. Earthworms do not have teeth, so they use the strong muscles of the gizzard (and grains of sand and soil) to grind up their food.
Detailed explanation-5: -Crop: The crop is a storage compartment for food and other things an earthworm swallows. From the crop, lunch goes to the gizzard. Gizzard: The gizzard is where the work happens. Any stones that have been swallowed and the strong muscles of the gizzard grinds up the leaves.