 |
The United States of America—also referred to as the United States, the USA, the U.S., America, or (archaically) Columbia–is a federal republic of 50 states and the District of Columbia. |
 |
Ancient Egypt as a general historical term broadly refers to the civilization of the Lower Nile Valley (or the Great Rift Valley) between the First Cataract and the mouths of the Nile Delta, from circa 3300 B.C.E. |
 |
The Inca Empire (called Tawantinsuyu in modern spelling, Aymara and Quechua, or Tahuantinsuyu in old spelling Quechua), was an empire located in South America from 1438 c. |
 |
The Aztecs were a Mesoamerican people of central Mexico in the fourteenth, fifteenth, and sixteenth centuries. |
 |
Birds (class Aves) are bipedal, warm-blooded, oviparous (egg-laying) vertebrates characterized primarily by feathers, forelimbs modified as wings, and a bony beak without teeth. |
 |
The main group elements of the periodic table are groups 1, 2 and 13 through 18. Elements in these groups are collectively known as main group or representative elements. |
 |
Constantinople (Greek: Κωνσταντινούπολη) was the capital of the Byzantine Empire and, following its fall in 1453, of the Ottoman Empire until 1930, when it was renamed Istanbul as part of Mustafa Kemal Atatürk's Turkish national reforms. |
 |
The Seven Wonders of the World (or the Seven Wonders of the Ancient World) is a widely known list of seven remarkable constructions of antiquity. |
 |
Civilization refers to a complex human society, in which people live in groups of settled dwellings comprising cities. |
 |
Algae (singular alga) are a large and diverse group of photosynthetic, eukaryotic, plant-like organisms that use chlorophyll in capturing light energy, but lack characteristic plant structures such as leaves, roots, flowers, vascular tissue, and seeds. |
 |
Biology is the "science of life." It is the study of living and once-living things, from submicroscopic structures in single-celled organisms to entire ecosystems with billions of interacting organisms; it further ranges in time focus from a single metabolic reaction inside a cell to the life history of one individual and on to the course of many species over eons of time. |
 |
Coffea (the coffee plant) is a genus of ten species of flowering plants in the family Rubiaceae. |
 |
Agriculture (a term which encompasses farming) is the process of producing food, feed, fiber, fuel, and other goods by the systematic raising of plants and animals. |
|
 |
As commonly defined, the human body is the physical manifestation of a human being, a collection of chemical elements, mobile electrons, and electromagnetic fields present in extracellular materials and cellular components organized hierarchically into cells, tissues, organs,and organ systems. |
 |
In general discussion, a nation-state is variously called a "country," a "nation," or a "state. |
 |
World War II, also WWII, or the Second World War, was a global military conflict that took place between 1939 and 1945. It was the largest and deadliest war in history. |
 |
The watershed event of United States history was the American Civil War (1861–1865), fought in North America within the territory of the United States of America, between 24 mostly northern states of the Union and the Confederate States of America, a coalition of eleven southern states that declared their independence and claimed the right of secession from the Union in 1860–1861. |
 |
Animals are a major group of organisms, classified as the kingdom Animalia or Metazoa. |
 |
Intelligent design (ID) is the view that it is possible to infer from empirical evidence that "certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection" Intelligent design cannot be inferred from complexity alone, since complex patterns often happen by chance. |
 |
Globalization, as a concept, refers both to the "shrinking" of the world and the increased consciousness of the world as a whole. |
 |
Ecology or ecological science, is the scientific study of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment. |
 |
The Indus civilization is among the world's earliest civilizations, contemporary to the great Bronze Age empires of Mesopotamia and ancient Egypt. |
 |
Franklin Delano Roosevelt (January 30, 1882 – April 12, 1945) was the 32nd president of the United States, the longest-serving holder of the office and the only person to be elected president more than twice. |
 |
Broadly defined, biological evolution is any heritable change in a population of organisms over time. |
 |
Trees are the largest plants. They are not a single taxon (unit of biological classification) but include members of many plant taxa. |
 |
Bacteria (singular: bacterium) are a group of microscopic, single-celled prokaryotes—that is, organisms characterized by a lack of a nucleus or any other membrane-bound organelles. |
 |
Oxygen (chemical symbol O, atomic number 8) is the second most common element on Earth and the third most common element in the universe. |
|
