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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 40: The Circulatory System MCQ Multiple Choices Questions Quiz Test Bank
40.1 Overview of the Circulatory System
40.2 Components of the Blood
40.3 Mammalian Heart and Blood Vessels
40.4 Blood Flow and Blood Pressure Regulation
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