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?

One advantage in bony fish is the presence of an operculum which is used to

The structure labeled is

Which of the following form a symbiotic relationship with coral?

Biogeochemical cycles:

The structure indicated by the pointer is a(n)

The first forms of life on Earth were thought to be_______.