Please help will markbr />

it's either A or B because if there is a new type of frog with no predators, it would obviously mean overpopulate. but the frog, it depends what type it is because some frogs help the environment but some don't.

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.