Microorganisms that grow best in the absence of oxygen

A) pathogens
B) virulence
C) normal flora
D) aerobes
E) anaerobes
F) protozoa
G) ectoparasites
H) obligate parasites

Anaerobes

Microorganisms having the ability to live without oxygen.

Ectoparasites

Organisms that live on the external surface of a host, such as ticks and lice, surviving by feeding on the host's blood or skin.

Obligate Parasites

Organisms that cannot complete their life-cycle without exploiting a suitable host.