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How does gravity affect plant growth?

The environment provides various stimuli, such as sunlight and gravity, that elicit a growth response from the flora that inhabit it. These natural reactions are referred to as tropisms. Gravitropism pertains to a living thing's response to gravity, while phototropism is an organism's reaction to light.Gravity serves as a key determinant for root growth orientation. Plant roots sense the pull of gravity through specialized cells known as statocytes. These functional units house tiny structures called statoliths that descend to the base of the cells as gravity exerts its downward forc..

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What is an Egyptian shaduf?

The shaduf was invented by the ancient Egyptians, but it is still used today in India, Egypt and other countries. The machine is easy to use, and it is estimated that it can lift up to 660 gallons of water in a day. In ancient Egypt, the water reservoirs were built using mud and bricks to hold water in place. During heavy rains, a network of canals and a shaduf were used to fill the reservoirs with water.A shaduf played a crucial role in farming, as it was used to move water from one point to another for irrigation. This allowed the Egyptians to grow crops such as wheat and barley, even though..

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What did Alexander Mackenzie discover?

Mackenzie and his group made the journey by first following the Peace River to its source in the Rocky Mountains. Then, following the advice of the native tribes, they followed the Bella Coola River to the ocean. The expedition reportedly travelled over 36 miles a day for just over two years without losing a single member.

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What did Elizabeth Cady Stanton accomplish?

Stanton was an author, activist, leader and early organizer of women’s rights movements. She fought for women’s equality and for causes such as the right of women to sit on juries, to refuse sex with their husbands, and to receive equitable treatment under divorce laws. Through her associations with Lucretia Mott and Susan B. Anthony, she helped bring social reform that greatly improved the conditions for women in the 20th century.\nStanton helped organize the first women’s rights conventions. She also published several essays which laid out her beliefs. Along with Mott and Anthony, she ..

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What is Che Guevara known for?

Ernesto Guevara de la Serna was born into a well-to-do family in Argentina and earned a degree in medicine. During his studies, Guevara toured South America and witnessed severe poverty and inequality that later fueled his hatred of capitalism and interest in socialist politics. In the mid-1950s, Guevara met the exiled Fidel Castro in Mexico. He joined his rebel forces in the Sierra Maestra mountains in combat against the Cuban troops, earning him the title of commandant.\nUnder the Castro regime, Guevara was appointed head of the central bank and Minister of Industries, during which time he f..

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Where did the Shoshone Indians live?

The Shoshone were a small tribe that only numbered about 8,000 people. They were a nomadic tribe that ate whatever food they could find in the areas where they traveled, including antelope, berries, rabbit, buffalo and roots. The men wore loincloths, and the women wore aprons during hot weather. In winter, the members of the tribe wore pants and jackets lined with rabbit fur and large animal-hide capes. The word "Shoshone" means "valley people."

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What led to the duel between Alexander Hamilton and Aaron Burr?

Despite their differences, Burr’s political convictions were not so strong as to prevent him from allying himself where it would benefit him most. Hamilton, hoping to resurrect the Federalists and split the Democrat-Republican ticket, encouraged Burr to run in the 1800 presidential election. However, when the election became deadlocked, Hamilton worked to secure the election for Jefferson. Burr, feeling humiliated and betrayed, launched the first in a regular volley of pubic insults between the two.\nRealizing he stood no chance of becoming president in 1804, Burr began campaigning for gover..

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What were Martin Luther King's biggest achievements?

In 1963, King spearheaded a coalition of civil rights groups in a campaign to end segregation in Birmingham, Alabama, considered at the time the most segregated city in the nation. Demonstrations resulted in police brutality which outraged many Americans. Later that year, King helped organize and lead the March for Jobs and Freedom, known popularly as the March on Washington. The march drew more than 250,000 people to the National Mall, where King delivered his "I Have a Dream" speech. This speech was credited for galvanizing the nation in the passage of the Civil Rights Act the following year..

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Who invented the wedge?

An early form of the wedge was the hand-axe, found to be crafted in the early Paleolithic age by chipping away at a rock to form a sharp edge. The mechanical advantage of a wedge is equal to the ratio of the length of its slope to the width; a longer and skinnier wedge requires less force, so it's more effective for splitting an object than a shorter and wider wedge.

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What are some short-term causes of WWI?

The underlying reason for this domino-like progression of declarations of war was the political alignment of Europe in 1914. At the heart of the tension was the ongoing rivalry between Germany and the British Empire over control of the sea and access to colonial markets. Germany lacked overseas possessions and was in the process of building a large, modern navy. The British took this as a direct threat to their position and began seeking allies in Europe to contain German aggression. It was this elaborate network of alliances and mutual-defense pacts that set the stage for an event, any event,..

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