Guys i have a test in 20 minutes about cells from bacteria, animals, and plants. Please give me some tips because this is a HUGE test and im VERY stressed out.

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.