Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
Related questions
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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