Which among the following group of animals exhibit the following features- a) Segmentation b) Open circulatory system c) Blood filled coelomic cavity d) Jointed appendages
A
Sea anemone and liverfluke
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B
Flatworm and roundworm
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C
Sponges and corals
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D
Crab and spider
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Solution
The correct option is D Crab and spider All the characters mentioned belong to phylum Arthropoda. This phylum contains the largest number of animals. These organisms are bilaterally symmetrical. They have an open circulatory system. They have blood filled coelomic cavity. They have jointed appendages. The body is segmented externally. The body consists of head, thorax and abdomen.