Answer:
Option D, Light must travel one path from the source to the object, and another path from the object to the eye.
Explanation:
In optical physics it has been established that whatever object/things we are able to see is because of the light reflected by the object. Thus, it is clear that either the object must throw light of itself or it should have a source of light whose light can be reflected by object. The reflected light from object then reaches the eye of the viewer and he/she visualizes the object.
Thus, option D is correct.
Answer:
A strain is a genetic variant or subtype of a microorganism (e.g., virus or bacterium or fungus). Microbial strains can also be differentiated by their genetic makeup using metagenomic methods to maximize resolution within species. This has become a valuable tool to analyze the microbiome.
I hope it helps.
Have a great day.
A: Energy hope this helps