Which word refers to the smallest functional unit of a living thing?

a. cell
b. eyelash
c. organ
d. tissue

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

answer; i believe the correct answer is (anemia);