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Cenozoic of, relating to, or designating the most recent geological era that includes the present and began approximately 70 million years ago, when many mammals appeared, the modern continents took shape, and glacial ice formed. [1/2 definitions]
French Revolution the revolution in France that began in 1789 with the people's overthrow of the monarchy, continued with the establishment of a republic, and ended in 1799 with Napoleon's rise to power.
have used with a past participle to express an action or state that occurred at some point before the time of speaking or began in the past but continues into the present time. Also used with a past participle to express an action or state that occurred before another event in the past or before a projected future event viewed as if it were already complete. [1/15 definitions]
Holocene of, relating to, or designating the latest geological epoch of the Quaternary Period that includes the present and began approximately 10 thousand years ago, marked by the development of modern human culture; Recent. [1/2 definitions]
Miocene of, relating to, or designating the geological epoch between the Oligocene and Pliocene of the Tertiary Period, from approximately 26 million to 5 million years ago, when mammals began to acquire modern characteristics. [1/2 definitions]
modern art artistic production associated with a movement in art that began in the late 19th century and continued through the late 20th century, during which period an interest in realism and the use of traditional materials diminished and an interest in abstraction and experimentation with materials flourished.
Notre Dame de Paris a renowned cathedral in Paris, France, generally known simply as "Notre Dame." Construction of the Gothic-style cathedral began in the twelfth century.
Pangaea in plate tectonics, the single land mass that was composed of all the land on Earth until it began breaking into smaller continents 300 million years ago.
quaternary (cap.) of, relating to, or designating the latest geological period of the Cenozoic Era that includes the present and began approximately 1.8 million years ago, marked by widespread glaciers, the appearance of humans, and the development of human culture. [1/4 definitions]
should used to express the possibility of something happening although it is considered very unlikely (used in conditional clauses beginning with "if," or at the beginning of a clause, inverting with the subject, but having the same meaning as if the clause began with "if"). [1/5 definitions]
Silurian of, relating to, or designating the geological period between the Ordovician and Devonian of the Paleozoic Era, from approximately 440 million to 400 million years ago, when coral reefs began forming and land plants and air-breathing animals appeared. [1/2 definitions]