Fundamental niche includes all possibilities, Realized niche is the way things actually are. Descriptions will vary. Space, shelter and resources.
Niches are different.
Answers may vary but should include points discussed on pages 838 and 840. 5 a-d. Definitions in text 6. Scramble competition - individuals compete directly for limited resource. Contest competition - individuals compete indirectly for resources by competing for social dominance or possession of territory. Growth rate for sheep is too fast for resources.