Cells, Bacteria, and Viruses
Unicellular Cells
Because these organisms are too smaller to be observed directly.
yes small is an abstract word because people can see small in different ways you cant see it directly. Even when using your senses
Because, it is too small to see with the naked eye.
In order to see microshopic(very small) organisms. (like germs.)
A microbiologist would study living organisms that are too small to see with the naked human eye. They study microorganisms such as bacteria, viruses, fungi, and protozoa.
Biology of organisms to small for the human eye to see. This can be anywhere from a single cell, to an organism with a very small number of them.
It is multicellular. Unicellular organisms are too small to see.
There is no instrument in world which measure how small an object is but instruments measure how large an object is .
Microbiology is concerned with the study of organisms that are too small to be seen by the naked eye. These small organisms are called micro-organisms. E.g. :- bacteria, algae etc.
because they can see all the tiny organisms!
organisms in oceans, seas, and fresh water zoo plankton are also to small to see without a microscope