In the context of group size witch of the following in a phenomenon in which working in the presence of others increases effort or productivity?

There are traits like blood type and eye color, and others like speaking english or having a scar. what are the terms used to describe these different types of traits? how are each defined?

Which of the following did the founding fathers see as a benefit of the federal structure (federalism) of government? a.) all power is concentrated in the national government. b.) the power is divided between national and state governments. c.) all the power is concentrated in the state and local governments. d.) the power is divided between the people and the government

Which technological breakthrough of the 1950s revolutionized the way that americans kept up with news and world events? a) radio b) internet c) television d) motion pictures