28 Oct 2021
Problem 17
Page 721
Section 27.2: Review Questions
Chapter 27: Introduction to Animal Diversity
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28 Oct 2021
Background and context
Earth was formed around 4.5 billion years ago. It showed several climatic changes favoring the origin and evolution of different living organisms like microorganisms, animals, and plants. The appearance of different living organisms can be estimated by the fossil evidence which appeared during the geological timescale.
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