explain why the starfish is not classified as a vertebrate species course hero

by Dr. Seth Glover Jr. Published 2 years ago Updated 1 year ago 3 min read

Who was the first person to classify organisms?

Aug 01, 2020 · Starfish aren’t classified as a vertebrate species because they don’t have a backbone nor do they have a spinal column. To be classified as a vertebrate, an organism must have an internal backbone (of interlocking vertebrae) composed of cartilage, bone, or both. An since starfish do not have this, they cannot be classified as vertebrate.

Does the biological species concept still exist today?

Feb 03, 2021 · Invertebrates Pre-Lab Questions • Before reading the introduction, were you familiar with examples of ... after examing a star fish Explain why the starfish is not classified as a vertebrate species and what are some common animal traits that a starfish does not possess. Q&A. ... Course Hero is not sponsored or endorsed by any college or ...

What are the 3 characteristics of a species?

Because a starfish does not have a backbone/spinal cord. To be classified as a vertebrate, an organism must have an internal backbone (of interlocking vertebrae) composed of cartilage, bone, or both. An since starfish do not have this, they cannot be classified as vertebrate.

Why are starfish not classified as vertebrate species?

Sea stars are actually part of the phylum Echinoderm and are related to sea urchins, brittle stars and sea cucumbers – they are not fish at all! Fish are vertebrates; sea stars are invertebrates. Fish are typically covered with scales; sea stars are typically covered with spines.Oct 8, 2009

How do invertebrates compensate for not having a spine?

To compensate for the lack of an internal skeleton, most invertebrates have an external skeleton that protects their soft, inner body. This material is usually made from chitin, a derivative of glucose.

What are the differences between vertebrates and invertebrates?

Vertebrates have a skeletal structure with a spinal column or backbone. Invertebrates have no backbone, while vertebrates have a well-developed internal skeleton of cartilage and bone and a highly developed brain that is enclosed by a skull.

What are the differences of vertebrates and invertebrates?

Vertebrates are animals that have a backbone inside their body. The major groups include fish, amphibians, reptiles, birds and mammals. Invertebrates don't have a backbone. They either have a soft body, like worms and jellyfish, or a hard outer casing covering their body, like spiders and crabs.

What is a rotifer?

Rotifers (right) are tiny animals that are only a fraction of a millimeter long. They are usually found in fresh water. Why do you think rotifers are classified as animals and not protozoans. they are multicellular and reproduce sexually.

How much water does jellyfish have?

Jellyfish are about 95% water. Suggest what kind of support they use—an exoskeleton, endoskeleton, or hydroskeleton

Do echinoderms respond to injuries?

Some echinoderms respond to injuries in a way similar to that of planarians. Explain

What is the difference between ancestral character state and derived character state?

An ancestral character state is the character that occurred in each common ancestor of the group, while a derived character state is the changes of the characters that occurred later within the group.

Who proposed the concept of biological species?

It was proposed by Theodosius Dobzhansky and Ernst Mayr. The problem with this is that is does not account for asexual organisms or for space and time. (reproductive community that occupies a certain niche)

Why is taxonomy used?

Taxonomy is used as a system for naming and grouping species to communicate their order. Systematics is the study of variation between animal populations to find evolutionary relationships. Taxonomy came before systematics, pre-dating to evolutionary theory.

What is the difference between a cladogram and a phylogenetic tree?

A cladogram and a phylogenetic tree are similar, except a phylogenetic tree you must add information containing ancestors, time of evolutionary lineages, or amounts of evolutionary changes to a cladogram.

What are the three sources of phylogenetic information?

The 3 sources of phylogenetic information is: comparative morphology, comparative biochemistry, and comparative cytology . Comparative morphology is comparing anatomic features (in fossils). Comparative biochemistry is comparing RNA, DNA, and proteins. Comparative cytology is the comparisons of size and shape of chromosomes. Comparative biochemistry and cytology involve the study of living organisms.

What is the typological species concept?

Typological species concept is the idea that species do not change, they are fixed. A type specimen is an the original organism that was used to name a species or subspecies. A type specimen is usually kept in a museum (dinosaurs, for example). The biggest problem with this concept is that species never change, which we know is not true. It is not used to today, but it still exists because of the type specimens found in museums.

What is the hierarchy of classification?

Hierarchical system of classification means to arrange organisms into an ascending series of groups of increasing similarities. The groupings of the organisms is called a taxa (or taxon).