Problem: Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for healthy growth in rabbits has been reported to be at least 3 ppm in the diet. However, higher concentrations of copper (100 ppm, 200 ppm, or 500 ppm) in the diet of rabbits may favorably influence feed conversion efficiency, growth rates, and carcass dressing percentages.
What amount of copper salt is toxic in animals?
The answer is the following: 30 mg/kg

Problem: Unfortunately, requiring two characters to mark the end of a line introduces unnecessary complexity and questions as to how to interpret each character when encountered alone. To simplify matters plain text data streams, including files, on Multics used line feed (LF) alone as a line terminator. Unix and Unix-like systems, and Amiga systems, adopted this convention from Multics. The original Macintosh OS, Apple DOS, and ProDOS, on the other hand, used carriage return (CR) alone as a line terminator; however, since Apple replaced these operating systems with the Unix-based OS X operating system, they now use line feed (LF) as well.
Who adopted this practice from Multics?
The answer is the following: Unix and Unix-like systems, and Amiga systems

Problem: Tarragona has one of the region's most complete ritual sequences. The events start with the building of a huge barrel and ends with its burning with the effigies of the King and Queen. On Saturday, the main parade takes place with masked groups, zoomorphic figures, music and percussion bands, and groups with fireworks (the devils, the dragon, the ox, the female dragon). Carnival groups stand out for their clothes full of elegance, showing brilliant examples of fabric crafts, at the Saturday and Sunday parades. About 5,000 people are members of the parade groups.
What are the clothing of the Carnival groups full of?
The answer is the following: elegance

Problem: After years of demanding greater political autonomy, residents were given the right to directly elect a Head of Government and the representatives of the unicameral Legislative Assembly by popular vote in 1997. Ever since, the left-wing Party of the Democratic Revolution (PRD) has controlled both of them. In recent years, the local government has passed a wave of liberal policies, such as abortion on request, a limited form of euthanasia, no-fault divorce, and same-sex marriage. On January 29, 2016, it ceased to be called the Federal District (Spanish: Distrito Federal or D.F.) and is now in transition to become the country's 32nd federal entity, giving it a level of autonomy comparable to that of a state. Because of a clause in the Mexican Constitution, however, as the seat of the powers of the Union, it can never become a state, lest the capital of the country be relocated elsewhere.
What political party controls the Mexico City legislature? 
The answer is the following:
Party of the Democratic Revolution (PRD)