Which of the following pairs interacts with one another in a competitive manner? a. a bird and the snake that preys on the bird’s eggs. b. a bird and the mite that lives on the bird’s body. c. two birds of the same or different species living in different areas. d. two birds of the same or different species living in the same area

Competition is an interaction between members of the same species or between different species living in the same area. If resources, such as food, water, sunlight, territory,  are limited and several species depend on these resources, then, they must compete with the same or other species to gain the resources. 

the endomembrane system i think