Meaning: 'Invention' refers to the creation of something new, particularly a device or process.

Wrong options:

• barter: 'Barter' is a noun that refers to the exchange of goods or services without using money, which does not fit the context of technological development.
• law: 'Law' is a noun that refers to a system of rules, which is unrelated to the concept of technological advancement in telecommunication.
• exchange: 'Exchange' is a noun that refers to the act of giving one thing and receiving another, which does not fit as it does not describe the act of creating the telegraph.
• urge: 'Urge' is a verb that means to strongly encourage or persuade someone to do something, which does not fit grammatically or contextually here.
• means: 'Means' is a noun that refers to a method or way of doing something, but it does not convey the idea of creation or innovation.

Correct answer: means

Explanation: The term 'means' serves as a noun that indicates a method or way of doing something, which is appropriate in this context as it describes how Morse code signals were sent.

Meaning: 'Means' refers to a method or way of achieving something.

Wrong options:

• barter: 'Barter' does not fit as it refers to the exchange of goods or services, which is unrelated to the method of sending signals.
• law: 'Law' is not relevant here as it pertains to rules and regulations, not methods of communication.
• invention: 'Invention' does not fit as it refers to the creation of something new, rather than a method of sending signals.
• urge: 'Urge' is a verb that does not relate to the concept of a method or means of communication.
• exchange: 'Exchange' refers to the act of giving and receiving, which does not describe the method of sending Morse code.

Correct answer: exchange

Explanation: The word 'exchange' fits grammatically as a noun that describes the act of giving and receiving information, which is central to the context of global communication.

Meaning: 'Exchange' refers to the act of giving something and receiving something in return, particularly in the context of information.

Wrong options:

• barter: 'Barter' refers to the exchange of goods or services without money, which does not fit the context of information transfer.
• law: 'Law' is unrelated as it pertains to rules and regulations, not the act of exchanging information.
• invention: 'Invention' does not fit as it refers to the creation of something new, rather than the act of exchanging information.
• urge: 'Urge' is a verb that does not relate to the concept of exchanging information.
• means: 'Means' refers to a method or way of doing something, which does not convey the act of exchanging information.