I would say immigration only.
emigration would theoretically reduce the genetic variation as unique individuals leave, but immigration would bring unique traits into circulation in an ecosystem.
I'm not super great at biogy tho so this might not be right... :)
Albert, a student researcher, varies the amount of food given to rats in an experiment to measure the effect on their learning behavior. In albert's study, the amount of food given is the independent variable.
An independent variable is under the control of the experimenter. Independent variable does not depend on the other variables involved in the experiment. Since the amount of food is varied, it is not depending on other variables like size of mice, weight, etc.
Beets, carrots, turnips, onions, radishes, and (the odd one out) celeriac.
Answer:
don't know for sure sure but i would think branching
Explanation:
I think this cause of subspecies ( Bengal, Sumatran and Siberian tigers)
The answer is Eukaryotic cells