Some autotrophic euglena species become when light levels are low

Heterotrophic

Explanation:

Euglena are unicellular organism that can be both autotrophic and heterotrophic based on the intensity of light that is available to it.

It can act as an autotrophic organism when there is enough sunlight which helps in the process of photosynthesis.

In case there is low light intensity it becomes heterotrophic and obtains energy from other sources.

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.