Aforest fire wipes out all of the plant life in an area, causing the animals to leave. the ground becomes a mixture of soil and ashes. which order of succession is most likely to occur in the area?

a hardwood trees → shrubs → softwood trees → mosses

b bare rock → grasses → shrubs → hardwood trees

c grasses → shrubs → softwood trees → hardwood trees

d softwood trees → shrubs → mosses → lichens

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.