Question

Spiny skinned animals are?
A. Arthropoda
B. Echinoderms
C. Hemichordates
D. Cyclostomes

Answer 1

Hint: Some animals in the animal kingdom possess spines on their body surface, which function as a defense system to protect against predators. The spine of such an animal also possesses some poisonous material that injects into the body of the predator that helps to escape the prey.

Complete answer:
Those animals which possess spines on their body are called echinoderms. Echinoderms animals are mostly spiny skinned animals and they are mostly marine, which lives at the sea bottom, some of them are free-living and some of them are sessile. Echinoderm bear spine and pincer-like pedicellariae, symmetry is bilateral in larvae but in adult pentamerous radial.
Enterocoelomate organism and surrounded by ciliated peritoneum. The digestive tract is complete.
Examples of echinoderm are starfish, sea urchin, brittle star, feather star, and many more.
Arthropoda: It is the phylum of those animals, which possess a segmented body with jointed feet and appendages. The body is divided into head, thorax, and abdomen. It is the largest phylum of the animal kingdom, which consists of 900,000 species. They are found on land, soil, seawater, freshwater, and in the body of plants and animals as a parasite.
Hemichordata:- Animals of this phylum possess some similarities of chordate animal and placed into chordates but latter it places into another phylum of non-chordates of phylum hemichordates. They are exclusively marine and tuberculous living in burrows.
Cyclostomes:- it is a group of agnathans that consist of jawless fishes like lampreys and hagfishes. These animals belong to the phylum Chordata.
Hence, the correct option is B.

Note: Echinoderms animal, like starfishes possesses brilliant regenerative power if starfish arm cut of form their body so it could regenerate and sea urchin-like animal is dangerous to the coral population because they feed on coral and they may create an imbalance in marine life.