This map shows the population density for different regions of the world. if this trend continues, what is one likely effect in the regions with the darkest shading?
a.
birth rates will decrease.
b.
food insecurity will increase.
c.
water will be readily available.
d.
the amount of farmland per person will rise.

answer; /// i do believe its the ; //(iroquois)they were made up of several groups who spoke a common language;

forty niners migrated west due to gold discovery in california and it the west was a new place for hope this : )

explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.