Why are micro-organisms important?
Nutrient cycling, biodegradation, climate change, food spoilage, cause and control of disease, biotechnology.
Prokaryotes usually reproduce asexually. Will the offspring's be identical to the parent? Will the offspring be identical to each other?
Yes, identical to each other and the parent.
After entering a body, how do pathogens cause an infection?
Find a portal of entry, attach to host, survive hosts defense, cause disease, exit the host.