What effect did the standard gauge have on railroad lines? a. it allowed an engineer to stop all cars on a train at once. b. it allowed railroads to form a cross-country network. c. it converted some railroad cars into “hotel rooms on wheels.” d. it allowed railroads to carry freight as well as passengers.

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answer: francis bacon is well known for being the secont man to sail around the world. sir francis drake was the first englishman to sail around the world.

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depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.