Two species of beetles are both herbivores on the same host plant, and the presence of either beetle species reduces the population growth of the other. the relationship between these beetles is best described as

format change of dna.  

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.