Single Choice

Bilateral symmetry, segmentation, coelom and open circulatory system characterises which of the following Phyla?

AAnnelida
BMollusca
CArthropoda
Correct Answer
DEchinodermata

Solution

Arthropods show various body shapes with bilateral symmetry. They show segmentation. They have true coelom containing haemocoel. In arthropods, blood vascular/circulatory system is of open type where blood flows in haemocoel instead of blood vessels.
Hence the correct option is C.

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