Adisturbance is any relatively discrete event in time that does which of the following?

a. disrupts ecosystem, community or population structure
b. changes resources, substrate availability, or the physical environment
c. facilitates succession
d. all of the above
e. both a and b

Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time