Question

virus are extremely small and can be seen throughly ​

Answer 1

Answer:

Viruses are the smallest organisms.

Answer 2

Answer:

Electron microscopy

Electron microscopy (EM) has long been used in the discovery and description of viruses. Organisms smaller than bacteria have been known to exist since the late 19th century (11), but the first EM visualization of a virus came only after the electron microscope was developed.