Answer: Regression-artifact
Explanation:
Regression artifact is the process in which non- random samples that represent the population is selected along with defective correlation with each other .
According to the question, cross-over effect in data can tend to eliminate the impact of regression artifact in which different treatment is received by subject in a series to cancel out regression.
Other options are incorrect because history, attrition or local history are not the factors that can be eliminated by crossover effect.Thus, the correct option is regression artifact.
The most likely reason would be that this city has either been expanding and with that effectively decreasing the amount of available living spcace the animals and trees as well have, at the same time it is possible that this city has been emiting increased amounts of the different types of pollution - one example being light polution which can strongly influence certain ecological niches.
They were committing treason against the british crowne and if they were caught and captured they risked death
