which of the following statements about early events in the evolution of animals is true?
Which of the following statements about early events in the evolution of animals is true?
The early events in the evolution of animals were marked by several significant milestones. Here are some true statements about these early events:
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Emergence of Multicellularity: One important event was the development of multicellularity, where individual cells began to cluster and cooperate, leading to the formation of specialized tissues and eventually complex organisms.
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Evolution of Body Symmetry: Another notable event was the evolution of body symmetry. Animals evolved various forms of symmetry, such as radial symmetry (e.g., sea anemones) or bilateral symmetry (e.g., humans). This allowed for more efficient movement and the development of specialized sensory organs.
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Origins of Tissues and Organs: Early animals developed specialized tissues and organs. This allowed for the differentiation of functions within the organism, leading to increased complexity and adaptability.
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Development of Nervous Systems: The evolution of nervous systems was another critical step. Early animals developed simple nervous systems that allowed for basic sensing and responding to the environment. Over time, nervous systems became more complex, leading to the emergence of more advanced cognitive abilities.
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Diversification of Body Plans: Early animal evolution also saw the diversification of body plans. This led to the development of various animal forms, such as sponges, worms, mollusks, arthropods, and vertebrates. Each of these groups adapted to different environments and ecological niches.
It’s important to note that these statements represent common trends observed in the evolution of animals. However, the specific details and timeline of these events may vary depending on the specific group of animals being considered.