Refer to the figure.

-Research has suggested that in some cases, killer whales (Orcinus orca) have increased their predation on sea otters. This would have a(n) _______ effect on kelp.
A) direct positive
B) direct negative
C) indirect positive
D) indirect negative

Question

Refer to the figure.
 
-Research has suggested that in some cases, killer whales (Orcinus orca) have increased their predation on sea otters. This would have a(n) _______ effect on kelp.
A) direct positive 
B) direct negative 
C) indirect positive 
D) indirect negative

Quizplus · Accepted Answer

Killer whales prey on sea otters, which in turn prey on sea urchins. Sea urchins graze on kelp, so a decrease in sea otters would lead to an increase in sea urchins, which would in turn lead to a decrease in kelp.

Refer to the Figure