Which of the following is not true concerning cover crops?
a. they prevent soil erosion
b. they can fix nitrogen in soil
c. they are sold as cash crops
d. they add organic matter to soil?

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? ?