Marine ecosystems cover approximately 71% of Earth's surface making them the largest.

According to the Laws of Cricket the pitch length between the two wickets is exactly 22 yards.

The IMF and World Bank were both created at the Bretton Woods Conference in 1944.

Dengue is transmitted by infected female Aedes aegypti mosquitoes.

The ICJ — principal judicial organ of the UN — is located at the Peace Palace in The Hague Netherlands.

The Euro (€) is the official currency of 20 EU member states (the Eurozone).

Photosynthesis occurs in chloroplasts containing chlorophyll found primarily in green parts of plants.

PC stands for Personal Computer — a microcomputer designed for individual use.

Unreal wish (subjunctive mood) uses 'were' with all subjects regardless of person.

Zoology studies animals (Tiger). Astronomy studies celestial objects (Mars).

'Maiden speech' is an idiom for the very first speech given by a person.

N.B. abbreviates the Latin 'nota bene' meaning 'note well' to draw attention to important information.

A 'mare' is an adult female horse. The masculine form is 'stallion'.

Botany studies plants; Zoology studies animals.

'By phone/email/post' indicates means of communication. 'By phone' is standard.

The correct idiom is 'sink into oblivion' meaning to be completely forgotten.

'Call to mind' means to remember something.

'Pass away' is a euphemism for 'to die'.

'Authoritarian' and 'autocratic' both refer to strict obedience to authority with absolute power.

'Permissive' means allowing great freedom of behavior — closest to 'liberal'.