What do mollusks do

A mollusk? Gastropod and nautilus shells grow from their outermost edge. As the mollusk grows, its shell develops more whorls single turns in a spiral shell or chambers. In bivalves, new shell material is deposited on the edge that is farthest from the hinge. History Government U. Cities U. DK Nature: Arthropods. DK Nature: Worms. FEN Learning is part of Sandbox Networks, a digital learning company that operates education services and products for the 21st century.

Humans are deuterostomes, while insects are protostomes. These two groups, the deuterostomes and the protostomes, are believed to be the two large original branches of the bilaterian animal family tree. Because the relationships between the members of the family tree are uncertain, it is difficult to identify the features inherited from the last common ancestor of all molluscs.

For example, it is uncertain whether the ancestral mollusc was metameric composed of repeating units —if it was, that would suggest an origin from an annelid -like worm. The fossil record of mollusks is relatively complete, and they are well represented in most fossil-bearing marine strata. Very early organisms which have dubiously been compared to molluscs include Kimberella and Odontogriphus. In evolutionary theory, rarely is it stated that one species is directly descended from another but rather that they share a common ancestor species from whom both are descended one obvious example being Neanderthals and modern humans.

All the human-related genera of tribe Hominini that arose after divergence from Pan are members of the tribe Hominina, including the genera Homo and Australopithecus. What do mollusks and humans have in common? Contents 1 What do mollusks and humans have in common? A mantle which is a fold in the body wall that lines the shell.

Many molluscs have tentacles of one form or another. These are known as pallial tentacles. Among cephalopods, squid have spectacular tentacles. Last Updated: 14 days ago — Co-authors : 16 — Users : 8. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email. Home Answers About. Sign in. Forgot your password? Get help. Password recovery.

Home English What do all mollusks have in common? English General Lifestyle. Read the full answer All mollusks have a thin layer of tissue called a mantle which covers their internal organs. Beside this, Do mollusks have a mantle and a foot?

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