You are trying to remember the lyrics to one of your favorite songs. you have heard the song often, and sung it a hundred times, but right now you can’t remember how the words to the chorus start. with what part of your memory are you having difficulty?

You would be having difficulty with the place in your memory that remembers things that aren't your own. In other words you would have trouble with part or your memeroy that you would use when learning something new.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.