. when an irritant, such as a grain of sand, intrudes into the shell of the mussel and the mantle, or the interior of the mantle, the mussel coats the irritant with layers of the same substance that is used to create the shell. mother-of-pearl (nacre) which is mainly calcium carbonate and an organic...
usd million) jan-dec- (value in usd million) yoy growth %in usd jan-oct- (value in usd million) jan-oct- (value in usd million) growth %in usd india export of petroleum oils and oils obtained from bituminous minerals, other than crude; preparations not elsewhere specified or included, containing by...
part of the normal behaviour ( pomacea canaliculata ). breathing marisa cornuarietis . note the short siphon in this species. marisa cornuarietis with the penis sheath extended after mating. an years old pomacea diffusa with eroded shell . crawling pomacea diffusa . except where otherwise noted, this...
did not move much in the previous stage, it now makes circular movements inside the egg. these movements are mainly caused by the ciliar waterflow on the velum. at the front side of the embryo, the foot rudiment or pedal cell plate has become more prominent as the cells in this region have increased...
a shell kit, please go to esson_plan_checklist.html and print out the materials that you wish to use in your lesson plan. ) item done general lesson plan k - - - - optional printouts checklist: "this is the check list page": for lesson plans, printout articles, work sheets and miscellaneous activities...
of a snail very well. the blood of apple snails (and snailsin general) has two functions: transport of o , co , hormones, nutrition and waste products and a structural function: a hydroskeleton. the transport capacity of the blood for o and co is enhanced by the chemical substance hemocyanine in the...