complete the two questions, please type out your response Spines: Murex, and other surface crawling snails, live on loose, sandy substrates which provide no firmattachment for the animals. As a result, they cannot rely on strength of attachment to prevent being overturned orgrabbed by predators. Structures other than those associated with the foot must act in this defensive role. To examinethis question, place the Murex shell on the lab table with the aperture down. This is the normal life position of thesesnails. Nerita and Murex, and record your results in the appropriate spaces in Table 2. Note that for Nerita,aperture length is based on the distance between the outer lips of the aperture rather than between the inneredges.Calculate aperture area, shell area, and relative aperture area according to the formulae defined in Figure 2,and record the results of your calculations in Table 2.SpeciesN. tesellattaM. beaui1.50 CM3.52 CMB1.27 CM1.54 CMс2.5 CM5.5 CMD1.5 CM2.75 CMApertureShell1.905 CM5.42 CMShellArea3.75 CM15.1 CMTABLE 2: Morphometric data for grasping and crawling snails.RelativeApertureArea0.51 CM0.36 CMWhich of the two species has the largest aperture relative to the size of the shell? What is its life style?Considering that aperture size is an index of foot size, what adaptive advantage does alarge aperture convey to grasping snails? Of what value might this be to snails living onwave-swept rocks?

A mantle, a shell formed by the mantle, a visceral hump, a foot, and a radula are all features of mollusks. Mollusks are distinguished from other phyla by the presence of several features, most unique to the phylum Mollusca.Answer 1: N. tesellatta has 0.51 CM relative aperture and M. beaui has 0.36 CM relativ eaperture. Hence N. tesellatta has a larger aperture size. It is a grasper that grows on exposed rocks. Answer 2: A larger aperture results in a larger foot, which allows the snail to grip rocks securely against wave motion. Snails that live in wave-swept places require wider apertures for firmly holding them, or they will roll over and flow with the waves.Conclusion: As a result, increased wave activity is more likely to sweep snails away. A bigger hole reveals snails with larger feet to grip onto. It is less prone to wash away.