If you visit the Senate chamber during a session on an average day, you're most likely to find the session presided over by {Question options}: A) a president pro tem.
B) a speaker for the house.
C)the vice president of the United States.
D) the majority leader.

A) a PRESIDENT PRE TEM

Explanation:

On an averaged day the vice-president would not be present, he only preside the senate and puts in a vote if/when they have a tie, he/she would be there to break it

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.