What will most likely happen to this ecosystem if the swordfish are killed by a virus? and why?

a. it will be harder for sardines to survive.

b. the shark population will decrease.

c. the sardine population will decrease.

d. it will be easier for sharks to find food.

The shark population will decrease. (Ans. B)

Explanation:

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.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d