When a researcher manipulates a variable to see what effect the manipulation has on another variable, the research design is a(n)

answer; i believe the correct answer is (a) the correlation between the cause variable and outcome variable is zero;

the correct answer is a

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.

answer; ///relational devaluation;