What does it mean when a mutually beneficial relationship becomes interdependent?

What first caused people to consider that the continents were once one large landmass?

Which of the following events did not occur as a result of china’s open-door policy? a. trade between japan and china was encouraged. b. all countries were given equal access to chinese ports. c. foreign influence in china increased. d. the influence of the communist party weakened.

In the diagram, δgef and δhef are congruent. what is the value of x?