write down the characteristic feature of the
phylum portata
Answers
Phylum – Porifera includes organisms with holes.
They are primitive multicellular animals and have cellular level of organisation.
They are non-motile animals attached to some solid support.
Platyhelminthes are more complexly designed than the earlier groups.
They are bilaterally symmetrical.
They are triploblastic. This allows outside and inside body linings as well as some organs to be made. There is thus some degree of tissue formation [organ level of organisation].
Insects, arachnids and crustaceans are members of the largest category of creatures on the planet: arthropods.
Arthropods have hard, external shells called “exoskeletons,” segmented bodies and jointed legs.
Some familiar examples are prawns, butterflies, houseflies, spiders, scorpions and crabs.