The principle of "six degrees of separation" that suggests that everyone in the world is connected to everyone else within six steps, exemplifies which concept?

Should the city pass a ban on skateboarders on all public property, or are the citizens who oppose the ban right when they argue that there are benefits to having the skateboarders in public parks? plan and write a response in which you state your position and persuade readers to agree with you. support your position with reasons and examples drawn from the proposed amendment to ban skateboarding and from information in the letters to the editor, as well as from your own experience.

Population parameters are difficult to calculate due to

What does one prolonged blast and one short blast mean?