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Sea urchins can be classified as:

In birds, the gizzard is a structure associated with which system?

Analagous structures have the same function because they are derived from a common ancestral structure.

The only chordates that have lost segmentation as adults are:

All lophotrochozoans are triploblastic protostomes.

Sea stars, and other echiniderms, are all diploblastic protostomes.

 This fungus has a sac-like sporangium that known as a(n) _________________ . 

Referring to the image below, the red arrow is pointing to which of the following structures?  

All lophotrochozoans are coleomates.

What tissue type is shown in the image below?