The gaps (approximately 1 micrometer wide) formed between myelin sheath cells long the axons are called Nodes of Ranvier. Since fat serves as a good insulator, the myelin sheaths speed the rate of transmission of an electrical impulse along the axon.
Plants, extinct/ancient animals, and dinosaurs
Industrial revolution produced pollution, which became the reason of black pepper moth. When time passed, they became more suitable by the process of natural selection.
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