The correct answer is B) decreased migration of pests and pathogens
Answer:
the battle of gettysburg was the turning point of the Civil War for one main reason: Robert E. Lee's plan to invade the North and force an immediate end to the war failed. The collision of two great armies at Gettysburg put an end to that audacious plan.
Explanation:
Answer:
The Popham colony quickly failed due to a famine, disease, and conflict with local Native American tribes in the first two years. Jamestown occupied land belonging to the Powhatan Confederacy, and was also at the brink of failure before the arrival of a new group of settlers and supplies by ship in 1610.
The answer is: his study does not qualify as an experiment. For the study to be an experiment, Dr. Kline would have to manipulate the independent variable in a group (for example, apply a certain treatment) and also have a control group to which he doesn’t apply such treatment.
In this case, the study is an observational study because he only observed the subjects that were in the zoo that morning and measured the variable of his interest, that is the environmental attitude of the visitors, he did not apply a certain treatment to the group nor manipulate any variable.
