write a paragraph explaining why Jenner's research method might have been controversial. Then write another paragraph that supports or challenge his methods Please i need this now this is due today!! will mark brainiest

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.