How are unicellular organisms ,such as bacteria and fungi useful to humans and the environment. and what are 2 examples

Unicellular organisms like bacteria and fungi are very useful for human in various way.  Bacteria such as NItrobactor, Psuedomonas, Lactobacillus, E.coli are very useful in variety of use., Some fungi like Penicillium,  produce antibiotics, fungi is a good source of food.

Explanation:

Here we can understand the usefulness of bacteria and fungi by following points-

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.