A cell’s rate of exchanging materials with the environment positively relates to its surface area-to-volume (SA/V) ratio. Cell shape also correlates to its function. Also, spherical cells have the smallest surface area compared to all cells of the same volume but different shapes. Which of the following cell types is likely to have the highest rate of material change?

a flat epithelial cell with a diameter of 5 micron
a spherical immune cell with a diameter of 5 micron
a round mammalian oocyte with a diameter of 1 millimeter
a near-spherical intestinal stem cell with a diameter of 8 micron

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.