Cells within an organism can be very different from one another. For example, human red blood cells are filled with hemoglobin, are shaped like biconcave discs, lack a cell nucleus, and cannot synthesize proteins. Human muscle cells, on the other hand, are cylindrical in shape and have multiple nuclei. Cell specialization in the human body is usually due to

How can fertilizer use be detrimental to the environment? a. it can enter waterways, causing them to accumulate an excess of nutrients. b. high levels of fertilizer in bodies of water can lead to excess algal growth. c. fertilizer can lead to oxygen depletion, and be harmful to organisms in waterways. d. all of the above select the best answer from the choices provided a b c d