Problem: Please answer a question about the following article about Wood:
It has been used for thousands of years for both fuel and as a construction material. It is an organic material, a natural composite of cellulose fibers (which are strong in tension) embedded in a matrix of lignin which resists compression. Wood is sometimes defined as only the secondary xylem in the stems of trees, or it is defined more broadly to include the same type of tissue elsewhere such as in the roots of trees or shrubs.[citation needed] In a living tree it performs a support function, enabling woody plants to grow large or to stand up by themselves. It also conveys water and nutrients between the leaves, other growing tissues, and the roots. Wood may also refer to other plant materials with comparable properties, and to material engineered from wood, or wood chips or fiber.
What's the matrix in wood made up of?
A: lignin
Problem: Please answer a question about the following article about History of India:
During the time between 800 and 200 BCE the Shramana-movement formed, from which originated Jainism and Buddhism. In the same period the first Upanishads were written. After 500 BCE, the so-called "Second urbanization" started, with new urban settlements arising at the Ganges plain, especially the Central Ganges plain. The Central Ganges Plain, where Magadha gained prominence, forming the base of the Mauryan Empire, was a distinct cultural area, with new states arising after 500 BC[web 1] during the so-called "Second urbanization".[note 3] It was influenced by the Vedic culture, but differed markedly from the Kuru-Panchala region. It "was the area of the earliest known cultivation of rice in South Asia and by 1800 BC was the location of an advanced neolithic population associated with the sites of Chirand and Chechar". In this region the Shramanic movements flourished, and Jainism and Buddhism originated.
Where was the central location of the Muayan Empire?
A: Central Ganges Plain
Problem: Please answer a question about the following article about On the Origin of Species:
In Chapter II, Darwin specifies that the distinction between species and varieties is arbitrary, with experts disagreeing and changing their decisions when new forms were found. He concludes that "a well-marked variety may be justly called an incipient species" and that "species are only strongly marked and permanent varieties". He argues for the ubiquity of variation in nature. Historians have noted that naturalists had long been aware that the individuals of a species differed from one another, but had generally considered such variations to be limited and unimportant deviations from the archetype of each species, that archetype being a fixed ideal in the mind of God. Darwin and Wallace made variation among individuals of the same species central to understanding the natural world.
What did historians say that naturalists generally thought about the differences in variations in a species?
A: generally considered such variations to be limited and unimportant deviations from the archetype of each species
Problem: Please answer a question about the following article about Glacier:
Some rock formations in the path of a glacier are sculpted into small hills called roche moutonnee, or "sheepback" rock. Roche moutonnee are elongated, rounded, and asymmetrical bedrock knobs that can be produced by glacier erosion. They range in length from less than a meter to several hundred meters long. Roche moutonnee have a gentle slope on their up-glacier sides and a steep to vertical face on their down-glacier sides. The glacier abrades the smooth slope on the upstream side as it flows along, but tears loose and carries away rock from the downstream side via plucking.
What is another name for roche moutonnee?
A:
"sheepback" rock