The picture above shows an ocean bay food chain. Sea otters move into the ocean bay area. They eat all the sea urchins. This change will cause

• the kelp to have less food

• the crabs to have more food

• the sea ducks to have less food

• the arctic foxes to have more food

What is a trophic level?

• Each level represented within a food chain or web.
• Levels of ecosystems that the world is divided into.
• Different levels of nutrients present within an organism.
• The levels of sunlight an autotroph needs to survive. 

• A

• B

• C

• D

• A

• B

• C

• D

An organism that obtains its food at the expense of another living organism is known as a

• host

• saprophyte

• parasite

• scavenger

Some small fish attach themselves to the body of a shark with harming the shark and feed upon the leftovers from the sharks meal. The relationship between the shark and this fish is an example of

• Commensalism

• mutualism

• competition

• parasitism

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D