Evolution of animal diversity

Chapter 1

Science of Zoology and Evolution of animal diversity

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A Legacy of Change

Evolutionary diversification of Hawaiian honeycreepers

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Science of Zoology (1)

Zoology:

The scientific study of animals

Phylogeny or phylogenetic tree:

A diagram depicting the history of animal life

Branches represent evolutionary lineages

Each branching event represents the historical splitting of an ancestral species to form new ones

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Science of Zoology (2)

One major goal of studying animal diversity is to locate the origins of certain key developments such as multicellularity, a coelom, spiral cleavage, vertebrae, and homeothermy

Another goal is to understand historical processes that generate and maintain diverse species and adaptations

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Essential Characteristics of Science

Science is guided by natural law

Science must be explanatory by reference to natural law

The conjectures of science are testable against the observable world

The conclusions of science are tentative and therefore not necessarily the final word

Science is falsifiable

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Scientific Method

Hypothetic-deductive Method:

Scientific process of making a conjecture and then seeking empirical tests that potentially lead to its rejection

One begins this process by generating hypotheses, or potential explanations of a phenomenon of nature

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