Question

Which phylum are the most primitive and flagellated? Where are they found?

Options:

A. Phylum Arthropoda, found in terrestrial environments
B. Phylum Chordata, found in aquatic environments
C. Phylum Porifera, found in marine environments
D. Phylum Cnidaria, found in freshwater environments

Answer 1

The most primitive and flagellated organisms belong to the phylum Porifera, found primarily in marine environments. Cnidocytes are characteristic of phylum Cnidaria.

Step-by-step explanation:

The most primitive and flagellated organisms are found in the phylum Porifera, which are sponges and are commonly found in marine environments.

Cnidocytes, which are specialized cells used for stinging and capturing prey, are unique to the phylum Cnidaria. Members of the phylum Arthropoda have been successful in several habitats and are known for their joint appendages and exoskeletons. The phylum Chordata includes all vertebrate organisms and also encompasses several invertebrates.