28 Oct 2021
Problem 13
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. The appearance of different living organisms can be estimated by the fossil evidences which appeared during the geological timescale. According to various geological and fossil records and data, there are various geological periods of evolution of organisms.
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