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.
A) Give an example of an animal that has a complete digestive tract.
B) What is the most abundant and successful group of animals on earth today?
C) Name at least three ways in which this group benefits humans.
D) Name at least three ways in which this group causes trouble for humans.
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