The Microbial World

Birds

Protozoa (correct)

Mammals

is incorrect because insects are not microorganisms, B) is incorrect because mammals are not microorganisms, C) is incorrect because birds are not microorganisms.

Birds

is incorrect because insects do not cause the patches, B) is incorrect because bacteria do not cause the patches, D) is incorrect because birds do not cause the patches.

Fungi (correct)

Bacteria

Taste the soil

Observe under a microscope (correct)

Observe with unaided eye

is incorrect because smelling the soil does not help in observing microorganisms, B) is incorrect because microorganisms are too small to be seen with the unaided eye, D) is incorrect because tasting the soil is not a safe or recommended method