The structure labeled is the  

The caudal fin of the dogfish shark is an example of which chordate characteristic?

What percentage of earth’s surface is covered with ocean?

The efficiency of energy transfer from herring to seabirds is Trophic Level Productivity PCB (ppb) Phytoplankton 5048 1.56 Zooplankton 506 2.85 Herring 91 24 Seabird 12 3341 Porpoise 2 13698

Jaws appear to have evolved from

From which of the tissues labeled does a true coelom form?

A researcher noticed that in several small ponds, fish species A preyed on several smaller species, B,C,D,E,F.  When fish species A was removed from one of the ponds, prey species B and C disappeared.  What specific concept or term would be used to describe fish species A?

Which body plan represents a vertebrate animal, like a dog or cat?  

Animals that are segmented, have jointed appendages and an exoskeleton are members of the phylum

Which of the following is an example of a filter feeder in an estuary?