Chapter18: Life's Origin And Early Evolution
Section: Chapter Questions
Problem 12SA: Which of the following was not present by the end of Precambrian? a. archaea c. fungi b. bacteria d....
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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.
Question
What extinction event occurred about 200 mya? What animal groups were most affected by this event?
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