Which relationship below is an example of competitive in an ecosystem? A. Birds eat the insects that cattle dusturb while grazing, and they occasionally ride on the cows' backs.
B. Squirrels nest in an oak tree, and insects live under the ground near the tree.
C. Bald eagles and black bears fish from the same mountain lake.
D. Rabbits eat the grasses and shrubs in a meadow, and wolves eat the rabbits in the meadow.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous