Answer:
310
third and last option
Explanation:
Well i subtracted 450 by 140 and got 310
Then those ones make the most sense so
Hope this helps!
Answer:
Scanning electro microscopy
Explanation:
"A scanning electron microscope (SEM) scans a focused electron beam over a surface to create an image. The electrons in the beam interact with the sample, producing various signals that can be used to obtain information about the surface topography and composition"
Reference: Nanoscience Instruments. “Scanning Electron Microscopy.” Nanoscience Instruments, 2019
Explanation:

The capsid copies the host cell’s DNA is the role of the capsid play in viral reproduction.