But unlike human teeth, which come in different shapes for different purposes and in predetermined numbers, radula teeth can exist in different numbers, and they all have one sole duty - scraping. Articles from Britannica Encyclopedias for elementary and high school students. moxley lake love county, oklahoma ng nhp/ ng k . [3] The number of fossil species is estimated between 60,000 and 100,000 additional species. Hormone production is not well documented in mollusks other than gastropods and cephalopods. What type of symmetry do echinoderms exhibit as larvae? Good evidence exists for the appearance of gastropods, cephalopods, and bivalves in the Cambrian period, 541485.4million years ago. In primitive forms both cords are interconnected by lateral branches of nerve fibres. What are the units used for the ideal gas law? Mollusks have well developed body organs (nervous system, circulatory system, respiratory system, etc.) The head contains the "brain" and the sense organs. What type of circulatory system do echinoderms have? [43] (An extensive list of molluscs with unusual feeding habits is available in the appendix of .mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:#d33}.mw-parser-output .cs1-visible-error{color:#d33}.mw-parser-output .cs1-maint{display:none;color:#3a3;margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}GRAHAM, A.
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which part of the mollusk body contains organs?