It is c. excretory. the dialysis takes place if the kidneys are not functioning. the kidneys are part of the excretory system.
I think you just typed the answer in the 2nd paragraph:)
The chef cuts the steak into two halves, it is a physical change, because the color and/or odor do not change, in which change in smell and odor is characterized as chemical change.
the chef melts the ice on the vegetables by leaving it outside in the kitchen in normal temperature, (assuming the kitchen is around 20+ celsius degrees).
it is physical change because only the shape changes, the color and/or odor do not change.
A light microscope instead of the electron is easier to use the light shows you basics the electron shows you more advanced featrues.
