Explain how the Arthropods are a more anvanced group than the Mollusks. PLZ!!!!?
463046
Arthropods have segmentation and jointed appendages (which some can use for exciting things like... flying or walking).\n\nhttp://www.sidwell.edu/us/science/vlb5/Labs/Classification_Lab/Eukarya/Animalia/\n\nor \n\nhttp://evolution.berkeley.edu/evolibrary/article/0_0_0/arthropods_toc_01\n\nCheers -
669508
Insects are all hexapods.  Other arthropods have more legs, that's the essential.  If it has more than 6 legs, it's not an insect.  Spiders are not insects.
831259
You have got to be kidding me. I have a favorite 'prehistoric water-dwelling animal'? I believe in a young earth anyway, so they're not prehistoric. I guess maybe Leviathan.
77957
Interesting question, because it shows the difference between two levels or types of speech.\n"Bug" is a common term that people use with different meanings.\nIn contrast, scientific names of natural groups have the same definition and content all around the world. In that sense, 'Insecta' (insects) is a class of arthropods that includes animals with articulated exoskeleton, 3 pairs of legs, 1 pair of antennae, and body divided into head, thorax and abdomen (among other characteristics). The definition of insect is the same everywhere.\nSo, those terms are not opposites, but whether one comprises the other will depend on the popular definition of 'bug'. Some people include also spiders, which are not insects, in the 'bug' category. For others, bugs are only beetles, and therefore would be included in the definition of Insects.\nI looked in my dictionary and it said:\n1. A true bug. \n2. An insect or similar organism, such as a centipede or an earwig. \n3. A disease-producing microorganism.\n\nSo I'd say that for most people, bugs are "insects + others" as you put it.
788917
Have a look at the limbs of a lizard.  Not too unlike ours - has all the same sections in the same places.  Some even have five "fingers".  \n\nWhen mammals came along they took the format much further - creating ungulates with two toes, horses with one, dogs with four and a dew claw.  \n\nEven whales have the skeletal bones of hands in their pectoral fins.  \n\nLemurs are supposedly more primitive than monkeys and apes, but go see them at a zoo.  I was lucky enough to hand feed one, and it has hands remarkably like a tiny human.  It was unreal.  \n\nThe format has changed constantly, built on a vertibrate format developed initially by fish.
88976
nvertebrates are an extraordinarily diverse group of animals that include over 30 phyla. Invertebrates do not have a backbone, nor a bony skeleton. This large group of animals includes sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, echinoderms, and arthropods.\nSubtopics\nArthropods (290) Flatworms (6) Cnidarians (6) Mollusks (9) Echinoderms (7) Segmented Worms (5)
746078
What is the difference between a travios and a brand new prius car? They both are transportation, but what difference. YOU are saying none of those structures would help the beetle in bombarding, but talk to an entomologist and he will explain how this marvel evolved. Think of the eye, in it's" perfection", yet extant in the world are all sorts of eyes that " are structures that exists separately " and are in various percentage stages that are are any where from 5% of an eye to the full human, bird and octopus eye. So we know it does work. I am too tired to go on tonight, so I hope this question attracts more responses.
1012471
(A) protozoa\n(B) protozoa are eukaryotes (have membrane bound organelles), bacteria are prokaryotes (no nucleus, organelles, etc)\n(C) there are thousands of protozoans in Kingdom Protista (maybe even millions)\n(D) Protozoans are animal like because they are motile (some have flagella and/or cillia), SOME of them cannot produce their own food (via photosynthesis), so they have to get food from their environment, and some are sexually reproducing organisms.\n(E) via sexual reproduction\n\n(F) next time pay attention in class :)
509699
They vary as widely as the body plans of different mollusks, but basically there are both macrophagous (herbivores and predators) and microphagous (suspension feeders) forms.\n \n**Gasteropods (snails and slugs) are mainly herbivorous; they use their radula to scratch plant tissues. However, there are also predatory snails (with modified radula, or proboscis, or even a venom-injecting radula). There are also microphagous planktonic forms (pteropods).\n**Cephalopods (squids, octopi and their relatives) are predatory carnivores, they have a modified radula and a horny "beak" with which they eat different invertebrates and vertebrates.\n**Bivalves (clams, mussels, oysters, etc) are primarily microphagous or suspension (filter) feeders. They don't have a radula and rely on their modified gills for filtration. There are also some primitive detritivores among the bivalvians.\n**The chitons (Polyplacophora) are grazing herbivores (with  radula).\n**The Scaphopoda (tusk shells) capture small food items (particulate matter) with their tentacles (captacula).\n**Other less known mollusks include the caudofoveatans (these capture foraminiferans and other very small organisms from sediments), solenogasters (these eat corals) and monoplacophorans (with a radula, but not much is known about their ecology).
122189
The first were some stem (basal) tetrapods, derived from crossopterygian fishes. Usually they're classified as amphibians, but they looked very different from modern amphibians. They were large (1 m or more), had fin rays on their tails and more than 5 fingers.\nDo a web search for Acanthostega and Ichthyostega.
269847
That must be another cephalopod, an ammonite. There's an amazing diversity of these fossil mollusks, with many genera and species. \nPictures:\nhttp://home.tele2.fr/hildoceras/Amaltheus_causses.jpg\nhttp://www.mnhn.fr/expo/agesterre/ammonites.jpg\n\nBut ammonites are grey only because they're fossil (i.e. made of stone), I don't think ammonites were that color while they lived.
831162
Your question has a number of difficult aspects to it, but I have asked a friend of mine to help me do some research into the answer for you and I think he has included a great number of pieces of information that you may find interesting.\nHere is what I eventually decided was the most productive answer to give you. I hope it helps you out! (after all, it is 99% his answer I have included below. He generally gives me such good feedback that I try to quote him directly as much as possible.)\nHere we go: An animal is:\nAn organized living being endowed with sensation and the power of voluntary motion, and also characterized by taking its food into an internal cavity or stomach for digestion; by giving carbonic acid to the air and taking oxygen in the process of respiration; and by increasing in motive power or active aggressive force with progress to maturity.\nOR:\nAny of a kingdom (Animalia) of living things including many-celled organisms and often many of the single-celled ones (as protozoans) that typically differ from plants in having cells without cellulose walls, in lacking chlorophyll and the capacity for photosynthesis, in requiring more complex food materials (as proteins), in being organized to a greater degree of complexity, and in having the capacity for spontaneous movement and rapid motor responses to stimulation" These are the animal subkingdoms, and the principal classes under them:\n* Vertebrata, including Mammalia or Mammals, Aves or Birds, Reptilia, Amphibia, Pisces or Fishes, Marsipobranchiata (Craniota); and Leptocardia (Acrania).\n* Tunicata, including the Thaliacea, and Ascidioidea or Ascidians.\n* Articulata or Annulosa, including Insecta, Myriapoda, Malacapoda, Arachnida, Pycnogonida, Merostomata, Crustacea (Arthropoda); and Annelida, Gehyrea (Anarthropoda).\n* Helminthes or Vermes, including Rotifera, Ch�tognatha, Nematoidea, Acanthocephala, Nemertina, Turbellaria, Trematoda, Cestoidea, Mesozea.\n* Molluscoidea, including Brachiopoda and Bryozoa.\n* Mollusca, including Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, Lamellibranchiata or Acephala.\n* Echinodermata, including Holothurioidea, Echinoidea, Asterioidea, Ophiuroidea, and Crinoidea.\n* Coelenterata, including Anthozoa or Polyps, Ctenophora, and Hydrozoa or Acalephs.\n* Spongiozoa or Porifera, including the sponges.\n* Protozoa, including Infusoria and Rhizopoda.
596712
snails have a shell, slugs doesn't
542027
Reminder: 5n Theory, all continents used to be attached to one another- so in theory this is highly possible- if two of every species has moved from place to place. Also remember, animals have a good sense of unusual events happening, like earthquakes and things, so they might have had the sense to know where to go. Then you might ask about the unicorns, but it is said that they were too stubborn to get on the ship... dragons and pegasuses... I have no idea about.
269104
The Annelida have bilateral symmetry .The annelids also have a one-way digestive system . It has a segmented anterior with 8 hearts in each. It also has a body cavity. \n\nThe Mollusks are also bilateral like the annelids. They have a good nervous system. They also have a one-way digestive system. They have a coelom like the . The classes of mollusks are the bivalves, which have two valves, which the name suggests. It has 2 shells and 3 layers also. It has a mantle and it lives in the water. It has gills and abductor muscles. It has an excurrent and incurrent siphon, which no other phylum has. There are the gastropods, which live in land and ocean. It has one shell and one foot. There are also the cephalopods, which has tentacles a foot that can either be a sucker or hook.
208899
That is not a good question. A cladogram expresses the ancestor-descendant relationships by means of _branches_, not by means of an ascending or ordered system. Thus, a goldfish would not come "before" a horse, nor a lamprey before a platypus. All the animals in your list do not even belong to a single nested group of taxa.\nThe sparrow is more related to the crocodile, the horse with the human and they in turn with the platypus, but all them, as well as lampreys, frogs, goldfish,  have their own evolutionary histories and their phylogenetic relationships are more complex than that.\nTell that to your teacher!
316365
Mollusks (e.g., clams, snails, and slugs) and Crustaceans (e.g., crabs, lobsters, etc.)  Even the more active mollusks (squids, octopuses) and arthropods (flying insects)