Write three sentences explaining how slavery develop in the American colonies of

However, many consider a significant starting point to slavery in America to be 1619, when the privateer The White Lion brought 20 African slaves ashore in the British colony of Jamestown, Virginia. The crew had seized the Africans from the Portugese slave ship Sao Jao Bautista.

Explanation:

answer; (d) none of the above;

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.