Question

A rise in the orca population has decreased the amount of sea otters. Based on the food web here and what we learned in class, the sea otter is considered



(1 point)
Responses

a producer.
a producer.

a Keystone species.
a Keystone species.

in equilibrium.
in equilibrium.

an apex predator.
an apex predator.
Question 2
When the sea otter population decreases, what happens to the sea urchin?(1 point)
Responses

increases
increases

decreases
decreases

stays the same
stays the same

none of the above
none of the above
Question 3
If a toxin gets into this marine ecosystem, which species would accumulate to the greatest toxin level concentration as a result of biomagnification? (1 point)
Responses

the kelp
the kelp

the orca
the orca

the crab
the crab

the sea urchin

Answer 1

**Question 1:** The sea otter is considered

**Response:** a Keystone species.

**Question 2:** When the sea otter population decreases, what happens to the sea urchin?

**Response:** increases.

**Question 3:** If a toxin gets into this marine ecosystem, which species would accumulate to the greatest toxin level concentration as a result of biomagnification?

**Response:** the orca.