We need a noun here as denoted by the use of the article AN (articles are used to modify only nouns). The sentence seeks to convey that almost everyone would like to live longer and some scientists are trying to make it possible but they are employing extreme measures to achieve that. EXTENSION and EXPANSION fit contextually. They both can be used to refer to the action or process of enlarging or extending something. EXTENT- the size or scale of something. EXPANSE- a wide continuous area of something EXPEDITE- make (an action or process) happen sooner or be accomplished more quickly. EXPEDIENT- (of an action) convenient and practical, although possibly improper or immoral.
Which country's National Assembly has appointed the country's top security official To Lam as its new President?
Which country hosted the 3rd Summit for Democracy?
In which country did the Indian High Commission host the national Davis Cup team, marking their first visit in 60 years?
Which state initiated offering medical education in Hindi on Hindi Diwas Day 2024?
Which Indian state launched the 'Nandini Ksheera Bhagya' scheme for free milk distribution to school children?
The Insolvency and Bankruptcy Code (IBC) was enacted in which year?
Who has recently unveiled its ambitious plan to build the first lunar railway system?
India recently handed over what amount to BIMSTEC Secretariat’s operational budget?
Which country has recently officially declared Pokhara as the 'Tourism Capital' of the country?
Which city serves as the capital of Tajikistan, known for its Pamir Mountains and ancient Silk Road cities ?