Animal Diversity
Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.
Platyhelminthes
Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.
What are the basic requirements for an organism to categorized as biologically alive? Such as growing...
It is very difficult to define life. Life may be regarded as a property of living things which distinguishes them from non-living things. Again, scientists have tried to define life on the basis of a number of characteristic features. These features include metabolism, reproduction etc. Anything that exhibits these characteristics is called living.
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