An energy pyramid shows the amount of
available at each feeding level in an ecosystem

Energy

Explanation:

An energy pyramid shows the amount of energy available at each feeding level in an ecosystem.

b would be the right answer

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.