Telepone wires sag in summer. Why​

Telephone wires are made up of Copper. As we know that metals expand in heat and shrink in cold temperatures. So, during summer the rising temperature makes the copper in the wire expand - so it gets sagged

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step-by-step explanation:

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.