Answer:
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Explanation:
Animals are absolutely everywhere! Even crowded cities are swarming with animal life, from the smallest creatures such as bugs and mice, to bigger ones such as dogs and birds. According to scientists, there are over tem million types of animals all over the globe, and they are classified into several categories.
To begin with, one must understand that this classification is also based on the origins of animals. Around 3.5 billion years ago, it is believed that life forms started to appear. Later on, they would evolve and become what they are today. From unicellular microorganisms to multicellular life forms, animals have separated into different species and families, differentiated by numerous vital characteristics.
