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 traits or innovations allowed movement of animals onto land, and why might these
traits have been advantageous?
Physical or behavioural adaptations are possible. A physical adaptation is a form of structural adjustment done to a body part. A behavioural adaptation is something that an animal does, or how it behaves, in response to external stimuli. Any behavioural or physical traits of an animal that assist it in surviving in its environment are referred to as adaptations. Body parts, body coverings, and behaviours are the three basic groups of these traits. Any or all of these types of adaptations are essential for an animal's survival.
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