Cutting ñstepsî or terraces into the sides of hills is one way to
a.
increase arable land for farming
b.
decrease the risks of flooding
c.
store water during times of drought
d.
decrease agricultural yields

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.