Which of the Following Statements About the Fundamental and Realized

Which of the following statements about the fundamental and realized niche are true? Check all that apply.

A) A species' realized niche could be the same size as its fundamental niche.
B) A species' realized niche could be smaller than its fundamental niche.
C) A species' fundamental niche can be smaller than its realized niche.
D) The extent of the realized niche is determined, in part, by interspecific competition.
E) The extent of the fundamental niche is determined, in part, by conditions of the physical environment.