Spiders exhibit the phenomenon of molting.
Clams has a mantle and an open circulatory system.
Earthworm have a coelom and a closed circulatory system.
Starfish has an endoskeleton made of calcium rich plates.
What is Phylum?
- "A primary category in biological taxonomy especially of animals that ranks above the class and below the kingdom."
- Animal kingdom consists following phylum: Porifera, Coelenterata, Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata and Chordata.
- Earthworms belong to Phylum Annelida. they are segmented, coelomates and has a closed circulatory system.
- Spider belongs to Phylum Arthropoda. They are segmented, have joined appendages and exoskeleton. In order to grow they have to shed their exoskeleton (this process is known as molting).
- Clams belongs to Phylum Mollusca, where mantle covers the visceral organs and have an open circulatory system (in which blood vessels are absent).
- Starfish belongs to Phylum Echinodermata. They are marine organisms, star-like appearance and their skeleton are made of calcium.
Hence, the correct options are: spider, clam, earthworm and starfish.
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