nature makes not such a failure - for a species, that don't die naturally, won't have much children. The outcome of a small reproduction-rate is less evolution. The nature is in these cases unbelievable effective. This species seems to be most possible = perfect evoluted for their construction. Molluskes are one of the first complex forms of life. For this step the species eventually has reached perfection - so it may survive the ages, but don't reproduce, or better: it has a very rare reproduction rate, because reproduction is only needed for evolution. So they will have less genetic diversity - for perfects is no reason to have.
The sharks are a very old species too - they didn't change t...

nature makes not such a failure - for a species, that don't die naturally, won't have much children. The outcome of a small reproduction-rate is less evolution. The nature is in these cases unbelievable effective. This species seems to be most possible = perfect evoluted for their construction. Molluskes are one of the first complex forms of life. For this step the species eventually has reached perfection - so it may survive the ages, but don't reproduce, or better: it has a very rare reproduction rate, because reproduction is only needed for evolution. So they will have less genetic diversity - for perfects is no reason to have.
The sharks are a very old species too - they didn't change their appearance essentially since 200.000.000 years! They are perfect! The first will be the last!
For the price of their ancient time perfection, they can't reach a really high step of psychical evolution. But if they were not perfect, they had not survived the big extinction of species and many smaller - at last the saurians.
(I fear, for this theme my english is horrible - sorry!)