### animal:

Mollusk
* All mollusks come from eggs.
* All mollusks have a muscular foot, soft bodies, and gills that they use for breathing
  - soft body with a special covering called the mantle
* Many mollusks feed by using a strap-like rasping organ called a radula to scrape up food.
* Many mollusks have a rough tongue that feels like sandpaper
  - tongue of sorts, called a radula
  - unique rasping tongue, called a radula, which is used for feeding
  - shells
  - use a tongue-shaped structure called a radula for feeding
* Most Mollusks have a soft body protected by a hard shell of calcium carbonate.
* Most mollusks also have a radula
  - are located in sea
  - can produce mucus
  - come from sea
  - eat phytoplankton
  - exhibit common features
  - exist in sea
  - grow shells
* Most mollusks has-part organs
  - valves
* Most mollusks have a hard shell enclosing a soft body
  - muscular foot to aid in movement and a feeding structure called a radula
  - soft, skin-like organ covered with a hard outside shell
  - calcium carbonate shells
  - feet
  - gastropods
  - gills, and well-developed organ systems
  - global significance
* Most mollusks have hard outer shells
  - hearts
  - males and females, while garden snails are hermaphroditic
  - muscular feet
  - rough tongues
  - spiral shells
* Most mollusks live in environments
  - habitats
* Most mollusks live in marine habitats, including gastropods and bivalves
* Most mollusks possess characteristics
  - well-developed sensory organs
  - relate to snails
  - require water
* Most mollusks undergo physical transformation
  - use gills for breathing
  - wear shells
* Some mollusks adapt to problems
  - also have a differentiated head
* Some mollusks are covered with shell and some has tentacles
  - critical to the basic ecology of some mangals
  - excellent swimmers, others crawl or burrow in mud and sand
  - hermaphroditic, which allows for more efficient reproduction
* Some mollusks are located in lakes
  - bury in sediments
  - cover their entire shell, others only a part
  - develop cavities
  - die in sea
  - grab moving objects with a sticky goo
* Some mollusks have a shell
  - distinct regions
  - exoskeletons
  - flexible body walls
  - importance
  - lungs
  - sex
  - tubes
  - inhabit trees
  - live for decades
* Some mollusks live in regions
  - rivers
  - streams
* Some mollusks live on dark ocean floors
  - land, such as the snail and slug
  - make phyla
  - possess bivalves
* Some mollusks rely on fertilization
  - internal fertilization
  - undergo metamorphosis
  - use cavities
* also enjoy munching mushrooms.
* also have a partially open system with both arteries and veins
  - an extension of the body wall called the mantle
  - nourish humans culturally
  - provide important data from the fossil record and deep time
* are a diverse group of animals, and play crucial roles in various ecosystems
  - group of soft-bodied animals that includes snails, scallops, clams, and sea slugs
* are a large and diverse group of animals of worldwide distribution
  - group of invertebrate animals
  - major food source still, especially in communities adjacent to the ocean
  - abundant fossils
* are an amazingly diverse group of animals that live in a wide variety of environments
  - important group of invertebrates in the animal kingdom
  - animals which usually have a soft body that is protected by a hard shell
  - bilateraly symetrical and are protostomes
  - coelomates
  - common and widespread in freshwater habitats
  - eaten freely when they can be obtained
* are found both in fresh and salt water and on land
  - throughout most mangrove habitats
  - herbivorous, grazing on algae
* are important as food, for decoration, and in scientific studies
  - to humans as well as other animals as food
* are invertebrates and are no exception
  - whose soft bodies are usually covered with hard shells
  - with soft bodies covered by a shell of one or more pieces
  - less numerous than ciliates
  - marine animals with soft bodies and no backbone
* are more likely than birds or insects
  - numerous than crustaceans
  - most diverse in marine habitats but also inhabit freshwater and terrestrial habitats
  - soft bodied, and usually have a hard shell secreted by a mantle
  - soft-bodied and have a true coelom
* are soft-bodied animals, but most are protected by a hard shell
  - which often live in hard shells
  - soft-bodied, and most have a prominent shell
* are the dominant invertebrate
  - most numerous of the four animals
  - second-largest invertebrate group
* are very abundant in some ecosystems
  - efficient in the use of their body parts
  - vital to sustaining many ecosystems
  - world wide and predominantly marine
* can be filter feeders
  - survive very dilute body fluids
* display a wide range of morphologies in each class and subclass.
* filter the water as they look for food.
* generally live in aquatic regions.
* have a complete digestive tract, spanning from the mouth to the anus
  - definite body plan, including a foot for locomotion, a head, and a visceral mass
  - mantle that plays a major role in breathing and excretion
  - simple heart, which pumps the blood throughout the body
  - an incomplete digestive system with one opening
  - bilateral symmetry
  - coelomate bodies and a complete digestive track
  - one or two hearts
* have soft bodies and most have shells
  - with no spinal column and are covered by a shell in one or more pieces
  - bodies, but some have a hard outer shell
  - teeth of magnetite of goethite
  - three body regions
* include snails.
* includes brains
  - carapaces
  - cell membranes
  - cells
  - corpi
  - cytoplasm
  - ears
  - faces
  - heads
  - nuclei
  - plasma membranes
  - sections
  - shellfishes
  - skulls
  - vacuoles
* is an invertebrate
  - many different environments where they play very intricate roles
* live in marine and freshwater habitats, as well as on land
* make up a scientific phylum of soft-bodied creatures, most often enclosed in a shell.
* occupy habitats ranging from the deep ocean to shallow waters to moist terrestrial niches.
* possess cells
  - well-developed muscle tissues
* provide a clear example of adaptive radiation
  - sensitive tool for monitoring environmental health
* tend to be shore-dwelling creatures.
* use sexual reproduction to pass on there genes.
* usually have three distinct sections
  - live where rivers and seas meet