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Lesson 5.04
Describe an annelid:

Describe an arthropod:

Describe an echinoderm:

Lesson 5.05
Which characteristic is shared by all arthropods?


Sea stars, sea urchins, sand dollars, and brittle stars are all members of the same group. What is the common name of the group to which they all belong?

Tell the three unifying characteristics of chordates?

Respuesta :

Answer:

All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages.

Explanation: As chordates, all vertebrates have a similar anatomy and morphology with the same qualifying characteristics: a notochord, a dorsal hollow nerve cord, and pharyngeal slits.

Annelids are worms such as earthworms and leeches. They have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain. Earthworms are important deposit feeders that help form and enrich soil.

An arthropod is part of a group of invertebrate animals (such as insects, arachnids, and crustaceans) that have a segmented body and jointed appendages, a usually chitinous exoskeleton molted at intervals, and a dorsal anterior brain connected to a ventral chain of ganglia.

An echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin

Annelid, arthropods, and echinoderms all are included under category non-chordates which means they do not possess notochord. On the other hands, chordates are the organisms which have notochord.

What are non-chordates?

Non-chordates are lifeforms that lack a notochord, which is a rod-like deformable structure that supports the body.

This phylum is made up of a small group of worm-like, marine species that are organized on an organ-system level.

It includes:

  • Porifera
  • Coelenterata
  • Ctenophora
  • Platyhelminthes
  • Aschelminthes
  • Annelida
  • Arthropoda
  • Mollusca
  • Echinodermata
  • Hemichordata

Annelids are worm-like organisms having segmentation, arthropods includes crabs, lobsters, centipedes, etc. and echinoderms are the organisms including starfish.

Arthropods have jointed appendages which is its defining feature.

Sea stars, sea urchins, sand dollars, and brittle stars are all members of the same group i.e., Echinodermata.

Chordates are the animals having notochord, a dorsal hollow tubular nerve cord, and pharyngeal slits.

Thus, these were some characteristics of the given animals.

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