The major structural difference between the rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER) is:
the rough ER is tubular and the smooth ER is flat
the rough ER is on the outside of the cell and the smooth ER is in the inside of
the cell
the rough ER is part of the endomembrane system and the smooth ER is not
the rough ER has ribosomes attached and the smooth does not
the rough ER has mitochondria connected to it and the smooth ER has
chloroplasts connected to it

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.