The flux of
is given by the surface integral

where
is the given square region, which we can parameterize by

with
and
. The area element is

where
is the normal vector to
. Depending on the orientation of
, this vector could be

or
; either way, the integral reduces to

an animal that feeds on carrion, dead plant material, or refuse
C whales have similar DNA to elephants
The answer is ”D”, “a higher frequency and a shorter wavelength.