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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 43: Animal Reproduction and Development MCQ Multiple Choices Questions Quiz Test Bank
43.1 Reproduction Methods
43.2 Fertilization
43.3 Human Reproductive Anatomy and Gametogenesis
43.4 Hormonal Control of Human Reproduction
43.5 Human Pregnancy and Birth
43.6 Fertilization and Early Embryonic Development
43.7 Organogenesis and Vertebrate Formation
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