What is the MAIN focus of the following paragraph? Disease and hunger ravaged Jamestown. Two desperate colonists were tied to posts and left to starve as punishment for raiding the colonies' stores. One colonist even took to cannibalism, eating his own wife. The fate of the venture was precarious. Yet still more colonists arrived, and their numbers included women.

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.        

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.