An example of a grad-school level question?
Which of the following helps the leaves break down after they have fallen off the tree?

An example of a grad-school level question?
Which change would most likely cause deer to die or leave a woodland?

An example of a grad-school level question?
When a multicellular organism is damaged, it will repair itself as

An example of a grad-school level question?
Which of the following organisms have the greatest effect on an ecosystem because of the changes they make to their environment?