Earthly Life 1. Origin of life: It is estimated that life on Earth began about 3.5 billion years ago. 1. Multicellularity: The emergence of multicellular life forms approximately 600 million years ago opened the door for the evolution of sophisticated animals. 2. Diversification: Animals underwent diversification and evolved into a number of taxa, including bilaterians, cnidarians, and sponges. Principal Animal Groups 1. Invertebrates: Mollusks, arachnids, and insects are examples of animals lacking backbones. 2. Vertebrates: Animals with backbones, including fish, amphibians, reptiles, birds, and mammals. Earthly Life 1. Origin of life: It is estimated that life on Earth began about 3.5 billion years ago. 1. Multicellularity: The emergence of multicellular life forms approximately 600 million years ago opened the door for the evolution of sophisticated animals. 2. Diversification: Animals underwent diversification and evolved into a number of taxa, including bilaterians, cnidarians, and sponges. Principal Animal Groups 1. Invertebrates: Mollusks, arachnids, and insects are examples of animals lacking backbones. 2. Vertebrates: Animals with backbones, including fish, amphibians, reptiles, birds, and mammals.
The Evolution and Adaptation of Animals 1. Environmental adaptation: Animals have evolved to live in a variety of settings, including deserts and oceans. 2. Animals exhibit the development of complicated behaviors.
With a huge range and a time span of millions of years, the history of animals is a fascinating and complicated subject. The Evolution and Adaptation of Animals 1. Environmental adaptation: Animals have evolved to live in a variety of settings, including deserts and oceans. 2. Animals exhibit the development of complicated behaviors. With a huge range and a time span of millions of years, the history of animals is a fascinating and complicated subject.
Earthly Life 1. Origin of life: It is estimated that life on Earth began about 3.5 billion years ago. 1. Multicellularity: The emergence of multicellular life forms approximately 600 million years ago opened the door for the evolution of sophisticated animals. 2. Diversification: Animals underwent diversification and evolved into a number of taxa, including bilaterians, cnidarians, and sponges.
Principal Animal Groups 1. Invertebrates: Mollusks, arachnids, and insects are examples of animals lacking backbones. 2. Vertebrates: Animals with backbones, including fish, amphibians, reptiles, birds, and mammals.
The Evolution and Adaptation of Animals 1. Environmental adaptation: Animals have evolved to live in a variety of settings, including deserts and oceans. 2. Animals exhibit the development of complicated behaviors.
With a huge range and a time span of millions of years, the history of animals is a fascinating and complicated subject.
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