A group of biology students tests the growth of bacteria under different conditions. The students apply the same amount of bacteria to identical
Petri dishes enriched with nutrients, then place
which the number of bacterial colonies
each plate at a different temperature. The
on
bacteria are allowed to
grow for three days, after
each plate is counted. What is the dependent variable in this experimenA

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction