What is the meaning of the word tetrad which is from the greek word tetra?
a. multiple
b. tetris
c. four
d. double

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

може ли да зареждате повече информация, моля