'Descend' means to go down, which is the opposite of 'ascend'.

'Simple' is the antonym of 'difficult', indicating ease.

'Contract' means to become smaller, which is the opposite of 'expand'.

'Rare' is the antonym of 'frequent', indicating something that does not happen often.

'Selfish' is the antonym of 'generous', indicating a lack of willingness to share.

'Heavy' is the opposite of 'light'.

'Quiet' is the antonym of 'noisy', meaning making little or no sound.

'Pessimistic' is the antonym of 'optimistic', which refers to a tendency to see the worst aspect of things.

'Complicated' is the opposite of 'simple'.

'Failure' is the opposite of 'success', indicating a lack of achievement.

'Car' is not an animal, while the others are all pets.

'Plentiful' means existing in large quantities, which is synonymous with 'abundant'.

'Reduce' means to make smaller or less, which is synonymous with 'diminish'.

'Hasten' means to speed up, which is the same as expedite.

'Mitigate' means to make something less severe, serious, or painful.

The Berlin Wall fell on November 9, 1989, marking a significant point in the Cold War.

The First Battle of Panipat was fought in 1526, marking the beginning of the Mughal Empire in India.

The first Gulf War began on August 2, 1990.

The partition of India occurred in 1947, leading to the creation of India and Pakistan.

The Rwandan Genocide took place in 1994.

The Rwandan Genocide occurred in 1994, resulting in the deaths of an estimated 800,000 people.

The Treaty on the Non-Proliferation of Nuclear Weapons (NPT) opened for signature on July 1, 1968.

The United Kingdom voted to leave the European Union in the Brexit referendum held on June 23, 2016.

The United Nations adopted the Sustainable Development Goals (SDGs) in 2015.

The Universal Declaration of Human Rights was adopted by the United Nations General Assembly on December 10, 1948.

The WHO declared COVID-19 a pandemic on March 11, 2020.

The Great Revolt of 1857, also known as the Sepoy Mutiny, began in the year 1857.

The Green Revolution in India began in 1965.

The Paris Agreement was adopted on December 12, 2015, during the 21st Conference of the Parties (COP21) in Paris.

The Treaty of Versailles was signed on June 28, 1919.