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Incomplete questions, where "the following" doe not follow, is definitely not a category of security threats!
You can view the challenges for pro perks by looking at your challenges under the perk category. There will be three challenges waiting for you to complete. After that you can upgrade to the pro version from the create a class menu
there are over forty million people worldwide whose vision is category 3 or worse, 80% of whom live in developing countries.
Yes, in order to reach a 70 to prestige you need 2,516,000 points. If you were to complete all of the primary gun challenges you would receive 2,572,750 points, and that is only one category of challenges. It is possible to just try to accomplish challenges to level up.
race is a social category
Yes, everything in the Barracks resets besides your title, emblem, and clan tag. But if it's your first time to prestige, then you get the Challenge category "Prestige." Plus, you get two new Challenges for every weapon except the Riot Shield. Once you finish these challenges, you unlock a new title and emblem.
There is now a specific Eurostar category. There are questions relating to Eurostar trains in the following categories: Train Travel, France, Technology, and Cars & Vehicles. Some of these will now be found in the Eurostar category.
daffodil = flower
Marijuana falls under the following categories: Drugs and illegal drugs
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You can find vast amounts of data and information about diamonds by following the Answer.com category for diamonds, below.
I would highly suggest the following: http://www.us.kohler.com/onlinecatalog/category.jsp?category=8 and http://www.us.kohler.com/onlinecatalog/category.jsp?category=4.