NEET BIOLOGY

Detailed explanation-1: -Both Arthropods and Molluscs have an open circulatory system. Metamerically segmented body is a feature in Annelida and Arthropoda. Thus, the correct answer is option A.

Detailed explanation-2: -Annelids are bilaterally symmetrical, metamerically segmented animals with a closed circulatory system. Molluscs are unsegmented and most of them have an open circulatory system.

Detailed explanation-3: -In this respect, arthropods are built like humans are; the right half of an arthropod is a mirror image of its left half-this is called bilateral symmetry (bi = two, latus = side).

Detailed explanation-4: -Metameric segmentation is the characteristic of Annelida and Arthropoda.

Detailed explanation-5: -Firstly, in the phylum annelida there is a large phylum thereby having nearly 20, 000 extant species with them. These kinds of phylum include ringed worms. These are mostly worm-like structures and they display bilateral symmetry with them. These have a closed circulatory system and metameric segmentation.