Question

invertebrates comprise nearly 95% of all animal species including organisms such as

- jellyfish, snails, leeches, and spiders

- earthworms, hagfish, squids, and rotifers

- sea squirts, sea anemone, snails, and lobsters

- sponges, lancelets, octopi, and butterflies

Answer 1

Option which all invertebrates is correct.

Option (a). Correct answer.
Jellyfish is marine invertebrate and member of phylum Cnidaria.
Snails are invertebrates and belongs to phylum mollusca.
Leeches are invertebrates and belongs to phylum annelida.
Spiders are invertebrates and belongs to phylum arthropoda.
• All animals given in this option are invertebrates so this is correct answer.

Option (b)
Earthworms are invertebrates and classified in phylum annelida.
Hagfish is jawless fish and belongs to chordata.
Squids are invertebrates and belongs to phylum mollusca.
Rotifers are aquatic invertebrates.
• In this option, hagfish is vertebrate, so this is incorrect option.

Option (c)
Sea squirts are vertebrates.
Sea anemones are invertebrates and belongs to phylum cnidaria.
Lobsters are invertebrates and belongs to phylum arthropoda.
• Sea squirts in this option are vertebrates, so this is incorrect option.

Option (d)
Sponges are members of phylum porifera (invertebrates).
Lancelet belongs to phylum chordata.
Octopi belongs to phylum mollusca (invertebrates).
Butterfly belongs to phylum arthropoda (invertebrates).
• Lancelet in this option is chordate, so this option is incorrect.