Chapter2: Aquatic Plants And Animals
Section: Chapter Questions
Problem 13SA
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Question
Name three important characteristics of animals.
Expert Solution
Step 1Animals form a kingdom of the eukaryotic multicellular organisms.
It is divided into parazoa and eumetazoa. They evolved six hundred million years ago. There are 3 - 30 million species. It is a diverse kingdom with its members having several characters in common. They are classified based on their anatomy, morphology, genetic composition and evolutionary relationships. They have complex structures with well differentiated functions. It includes thirty five phyla with most of them living in the sea and few in freshwater and land. They show different levels of organization like cellular, tissue and organ levels.
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