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Amensalism is the type of relationship that exists where one species is inhibited or completely obliterated and one is unaffected. This type of symbiosis is relatively uncommon in rudimentary reference texts, but is omnipresent in the natural world.[citation needed] There are two types of amensalism, competition and antibiosis. Competition is where a larger or stronger organisms deprives a smaller or weaker one from a resource. Antibiosis occurs when one organism is damaged or killed by another through a chemical secretion. An example of competition is a sapling growing under the shadow of a mature tree. The mature tree can begin to rob the sapling of necessary sunlight and, if the mature tree is very large, it can take up rainwater and deplete soil nutrients. Throughout the process the mature tree is unaffected. Indeed, if the sapling dies, the mature tree gains nutrients from the decaying sapling. Note that these nutrients become available because of the sapling's decomposition, rather than from the living sapling, which would be a case of parasitism.[citation needed] An example of antibiosis is Juglans nigra (black walnut), secreting juglone, a substance which destroys many herbaceous plants within its root zone.
What kinds of amensalism are there?
A: competition and antibiosis

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Pharmaceutical companies whose products are used in the three-drug cocktails for lethal injections are predominantly European, and they have strenuously objected to the use of their drugs for executions and taken steps to prevent their use. For example, Hospira, the sole American manufacturer of sodium thiopental, the critical anesthetic in the three-drug cocktail, announced in 2011 that it would no longer manufacture the drug for the American market, in part for ethical reasons and in part because its transfer of sodium thiopental manufacturing to Italy would subject it to the European Union's Torture Regulation, which forbids the use of any product manufactured within the Union for torture (as execution by lethal injection is considered by the Regulation). Since the drug manufacturers began taking these steps and the EU regulation ended the importation of drugs produced in Europe, the resulting shortage of execution drugs has led to or influenced decisions to impose moratoria in Arkansas, California, Kentucky, Louisiana, Mississippi, Montana, Nevada, North Carolina, and Tennessee.
When did Hospira begin to manufacture its lethal injection drug for the United States?
A: unanswerable

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The presence of the Virgin Mary under the cross[Jn. 19:26-27] has in itself been the subject of Marian art, and well known Catholic symbolism such as the Miraculous Medal and Pope John Paul II's Coat of Arms bearing a Marian Cross. And a number of Marian devotions also involve the presence of the Virgin Mary in Calvary, e.g., Pope John Paul II stated that "Mary was united to Jesus on the Cross". Well known works of Christian art by masters such as Raphael (e.g., the Mond Crucifixion), and Caravaggio (e.g., his Entombment) depict the Virgin Mary as part of the crucifixion scene.
Which pope claims Mary was present at Jesus' Crucifixion?
A: Pope John Paul II

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A watt balance is an instrument for comparing two powers, one of which is measured in SI watts and the other of which is measured in conventional electrical units. From the definition of the conventional watt W90, this gives a measure of the product KJ2RK in SI units, where RK is the von Klitzing constant which appears in the quantum Hall effect. If the theoretical treatments of the Josephson effect and the quantum Hall effect are valid, and in particular assuming that RK = h/e2, the measurement of KJ2RK is a direct determination of the Planck constant.
If the effects are valid, for RK = n/e2, what is the measurement of KJ2RK equal to?
A:
the Planck constant