Australia's Unique Flora and Fauna



Australia's Unique Flora and Fauna

Thesis Statement

Evolution by natural selection explains Australia's unique flora and fauna.

Introduction

Australia has millions of native species, in which 80 % are flowering plants, reptiles mammals, and frogs, and some freshwater fishes and birds. Australia's flora and fauna are different from other parts of the world. Most of its flora and fauna are related to Gondwana, which originated 141 million years ago. Australia separated from Antarctica 50 million years ago. Its climate has become drier and warmer and new plant species have evolved over time. The paper describes the theory of natural selection with respect to Australia's unique flora and fauna and describes why the variations occurred.

Discussion

The Theory of Natural Selection

This theory proposes that the environment selects variations and reduces harmful ones. The characteristics of a specific population change after many generations and they adapted to new environment. This theory describes that, there are variations in every population.

The individuals, who do not reach maturity are removed from that population and are replaced by the healthy population that are more suitable for survival.

Favourable conditions are passed from generations to generations.

Those that reproduce have favourable conditions and they are regarded as survival of the fittest.

The modifications in Australian flora and fauna have occurred through evolution.

By observing the Australia's fauna and flora and its geographical considerations, he contributed to his theory of evolution.

The Evolution of Australia's Flora and Fauna

According to Darwin's theory, the species change or evolve over time in response to environment changes. This theory has changed the way biologists understood the world, as it provides a logical explanation of life. This theory has changed the natural history of science. While Darwin riding from Sydney to other areas, he saw many species such as the platypus. He was the first scientist to see ...