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You are trying to identify an organism. It is multicellular and has neurons and muscle tissue, and definitely has vertebrae and a bony endoskeleton. It has a long and cylindrical shaped body that lacks legs.  It has smooth moist skin, small eyes and no ears.  It lives in moist tropical environments in shallow areas of water.  This organism is a/an:    

Which of these would result from a stabilizing selection pattern:

A certain unicellular eukaryote has cellulose based plates/shell, a pair of whiplike flagella, may be photosynthetic or heterotrophic, and population ‘blooms’ cause fish and shellfish and other animals to die from their toxins: to which group does it belong?

Which of the following describes an example of possible sympatric speciation:

Heat pits and Jacobson’s organs are found in what kind of vertebrate: 

Viviparity of some type occurs in at least some members of which of the following vertebrate groups:  

The theory of endosymbiosis:

Diploblastic organisms are found in which phylum:

Which structure(s) is/are lacking in bacteria?

What vertebrate detects the bioelectrical signals given off by prey [a], and what structure do they have that does this [b]: