If swordfish are killed by a virus in ocean biomass, the shark population will decrease because the shark consume swordfish (which are present in fourth tropical level of food chain in ocean or marine biomass) , so if there is nothing for sharks to eat they will eventually die.
Biomass is the total mass of living biological organism in an ecosystem at a given time.
The answer is a haemoccult test. This test involves laboratory testing of three consecutive stool samples for the presence of blood which is invisible to the eye (occult blood). Presence of blood in the stool, however, does not necessarily mean that a person has colorectal cancer.
