Gastropods make up the group of animals that include snails, slugs, limpets and sea hares. These animals are available in fresh or salt water as well as land. They are the largest gang of mollusks and possess existed since the early Cambrian period. A single shell as well as an asymmetrical body characterize these animals. There are three main subclasses of gastropods; the Prosobranchia (ocean snails), Opisthobranchia (sea slugs, sea butterflies and sea hares), and Pulmonata (land and freshwater snails and slugs). Each of the subclasses has evolved in their own way and members differ in their reproduction and life cycles within the subclasses. The gastropod folks are so large it really is impossible to spell out living cycle of each one individual species, but a majority of general rules do apply. The more evolved the species, the more complex their reproductive cycle in addition to their biology. Here we will look at the life span cycle of a gastropod through various examples and how they differ with regards to the type. L-arginine has been confirmed to aid raise blood movement to the penis, much like Viagra does, and the big difference is it does it effortlessly. Unlike other apes, orangutans tend to be more solitary. About the only time they encounter the other person is the place mating or sharing a fruiting tree. They spend roughly 90 percent of time in trees. They walk on all fours when on the ground and unlike the African apes, they use their palms or fists as an alternative to their knuckles. Males will move through the forest making loud howling calls, that may be heard 1.2 miles away, to make certain they stay out of each other's way. They are active in the daytime and at night, they'll build a nest by bending branches in to a platform so they can sleep on within the trees. To protect themselves in the rain and sun they are going to create a shelter from leafy branches, and they are even proven to use large leaves as umbrellas or ponchos. It is primarily the penetration of the male reproductive organ to the female's vaginal canal in the purpose of reproduction and bodily satisfaction.