Question

What is lifeline, of national economy?
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Answer 1

Answer:

The means of transportation and communication are called the lifelines of a nation and its economy because they are the pre-requisites for fast development.

Step-by-step explanation:

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Answer 2

$\underline\mathtt\color{pink}Answer$

The means of transportation and communication are called the lifelines of a nation and its economy because they are the pre-requisites for fast development.