Which experiment could the scientists use that would best determine if these tiny structures are spores?

The experiment that scientists could use that would best determine if the tiny structures are spores is called Opto-Electronic Imaging and Imaging Processing.

Explanation:

Optoelectronics speaks to the body of knowledge and of electronic devices that source, detect and control light and how they are used or applied. It is founded on the quantum mechanical effects of light on electronic materials.

Besides Optoelectronic Imaging, there are several other techniques that can be used to identify spores. Some of them are:

1. The culture-based methods: These methods involve the growing of spores on an agar plate and on the enumeration of colony units formed therein.  

2. Culture-independent methods: These methods are based on

the counting of spores under an electron microscope. This method utilizes the hybridization of DNA for the detection of pores. Opto-electric imaging is preferred and considered more efficient because it is faster than all the above processes that have been mentioned. The above processes have the disadvantage of time-consumption.

Cheers