Answer:
Mutualism is where both organisms in a situation interacting benefit.
Parasitism is where one organism is helped and the other is harmed.
Step-by-step explanation:
sea-lamprey eggs hatching on fish and feeding on the fish parasitism
bees pollinating the flowers of plants mutualism
mosquitoes sucking blood from the bodies of organisms parasitism
lactobacilli digesting certain foods in the human body mutualism