Unicellular organisms transport nutrients to all parts of their bodies by simple diffusion because they possess
A. a large surface area to volume ratio B. a large volume to surface area ratio C. bodies that are immersed in the nutrient D. bodies without membrane
Correct Answer: A
Explanation
The ability of unicellular organisms (such as amoeba and paramecium) to utilize diffusion as an effective means of transport is owed to their possession of large surface area to volume ratio. Multicellular organisms find it progressively difficult because of their small surface area to volume ratio.
