The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water. All echinoderms have one thing in common: radial symmetry. This means that the creatures have appendages (or body construction) which point outward from the center of the body like the spokes on a bicycle wheel. Furthermore, these appendages usually occur in multiples of five, although there are a few exceptions. There are several well known members of this group, like sea stars and sea urchins. The radial symmetry is obvious in these creatures.
The isolation barriers prevents two of the species to mate, resulting in them evolving into different species
Answer;
-Compare the length of DNA among the member of a species.
Explanation;
-Modern taxonomy encompasses more approvals in placement of a species into a group. A hierarchical system is used for classifying organisms to the species level. This system is called taxonomic classification.
-The modern classification is an extension of the system of classification proposed by Linnaeus. The present system of classification involves a series of graded taxonomic ranks called taxa which include phylum and family in addition to the four taxa introduced by Linnaeus.
The Healthcare Financial Management Association defines the revenue cycle . This cycle means that all administrative and clinical functions that contribute to the capture, management, and collection of patient service revenue. the following factors <span>contribute to the complexity of the revenue cycle in health care:
</span>- The nature and importance of the services provided; Regulations that complicate documentation and billings; and te existence of different payment methods and rates for multiple payers.