Which Phylum/Phyla shows only Tissues as Level of Organisation?
a) Ctenophora and Coelentrata
b) Porifera and Ctenophora
c) Platyhelminthes
d) CHORDATES
The phyla Ctenophora and Cnidaria (formerly known as Coelenterata) are examples of animals that exhibit only tissue-level organization. This means that they have specialized cells organized into tissues that perform specific functions, but they do not have well-defined organs or organ systems.Option a is the correct answer.