Which of the following is not an example of interactions between biotic and abiotic factors in an ecosystem? a. flowers opening at dawn and closing at night b. bears hibernating in winter c. male elk fighting over a female d. monarch butterflies migrating to mexico for the winter

Two male elk fighting over a female is not an example of abiotic and biotic factors in an ecosystem. Biotic factors are factors which are living such as plants and animals and abiotic factors are non-living organisms such as rocks, minerals, and even temperature and the wind. Therefore, flowers opening at night is an example of a biotic factor changing (the flower) to the abiotic factor (the sunlight). This patter fits for the other answers as well because bears and butterflies moving due to winter is a relationship between a biotic and an abiotic factor in the environment. 

All of them are man made