Bryozoan and Hydroid polyps share several apparent similarities with each other when it comes to shape, function, and behavior yet they are distinctly different in several ways as well.  Your challenge is to identify two separate functions (ie feeding, exchange, protection, reproduction) that these structures are utilized for and then contrast how the polyp arrays are either used in a similar or different manner to achieve this goal.  For the latter, you may consider such things as structure, mechanics, behavior etc.  Your focus should be on the polyp

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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5. Bryozoan and Hydroid polyps share several apparent similarities with each other when it comes to shape, function, and behavior yet they are distinctly different in several ways as well.  Your challenge is to identify two separate functions (ie feeding, exchange, protection, reproduction) that these structures are utilized for and then contrast how the polyp arrays are either used in a similar or different manner to achieve this goal.  For the latter, you may consider such things as structure, mechanics, behavior etc.  Your focus should be on the polyp itself and not on any structure(s) that house the polyp. To summarize - list two specific functions that polyp structures are used for. For each function, discuss similarities and differences in the way that bryozoans and hydroids use their polyps to achieve these functional goals.  
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