why are triploblastic organisms said to be more complex than diploblastic?
108279
One is three, one is two.  Three is more advanced, and therefore inherently more complex.\n\n:-p
621519
I think you're lacking the basic concept of how materials exist chemically (in what state). Elements can combine to form compounds that have completely different properties from the original elements. Or elements can exist as themselves (which is very rare). Now, most of the time when us humans invent some chemical, from fertilizers to drugs, they are a mixture of compounds. A mixture is anything 'mixed' together, bot 'combined'. So, your fertilizer will have many elements in compound forms. If there are any life forms, such as bacteria in organic fertilizer, these are highly organized forms of thousands of chemical compounds,  integrated to perform certain functions.
450305
The question was presented as an example of something puzzling - you have a substance - tartaric acid if i remember that is not optically active and then you have the same substance (but made as a result of microbial activity) that has identical properties, the only difference is that it is optically active - nobody then knew why\n\nhe let the optically inactive solution  crystalize, looked really close and well and compared - then noticed that the crystals differ - are like a miror image, he manually sorted them out and WOW the 2 solutions were optically active - the same degree but oposite direction (if you understand me, i do not know what this is called in english). then he assume that the microbes can do the sorting in their body. He spent his lifetime looking in microscopes or experimenting with unbelievable patience while enyybody else would have given up long time ago, thats why he made so many breakthroughs
885642
a- multi\nb-both\nc-both (plants like bacteria and animals)\nd-single celled
866462
Protists:  CLICK LINK BELOW FOR NAMES AND PICTURES ! YOU SHOULD BE ABLE TO PRINT THAT PAGE.\n\nSlime molds and algae are protists.\nSometimes they are called the odds and ends kingdom because its members are so different from one another.  Protists include all microscopic organisms that are not bacteria, not animals, not plants and not fungi.\nMost protists are unicellular. You may be wondering why those protists are not classified in the Archaebacteria or Eubacteria kingdoms.\nIt is because, unlike bacteria, protists are complex cells. \n \nThese delicate looking diatoms are classified in the protist kingdom. (Click link below for names and pictures.)
1022986
Two potentially unresolved questions in evolutionary biology are how and why did sex evolve (the big unresolved issue), and why only two as opposed to more sexes is stable. theory allegedly predicts three is more stable and better than two for example.\n\nYour text book anwsers, like recombination to break the linkage between "good" and "bad" genes and to avoid parasites (red queen hypothesis) explain why sex, ONCE it has evolved, is stable and selected for, BUT not how or why it evolved.\n\nPerhaps you should consider work by Lynn Marguilas et al. on the symbiont theory. Although now largely accepted that organelles like the mitochondria and chloroplast are degenearte symbionts, and less accepted that the nucleus is too, extrapolation of this theory would allow (account for) for the evolution of diploidy and reductive meisois (and thus sexual reproduction) by having two organisms (one aerobic the other anerobic) merging and seperating according to the oxygen levels (oxygen was at first a highly toxic compound to life untill aerobic metabolism evolved). \n\nBy the way hemaphrodites are still sexual, even selfing ones.\n\nAnd additionaly please note and remember for future that sexual discrimination, like homosexual discrimination, and so on, is neither a prerequisite nor a product of sexual reproduction.
594017
Being single celled. They have some of the most complex cells because their cells have to do all the work - as opposed to multicellular animals which have division of labour.
404478
Diploblastic organisms (eg. coelenterates) have two layers, ectoderm and endoderm.
827180
A compound word is a larger word made up of two smaller words, such as home-made, sun-light, etc.\n\nMaybe a tripound word is a larger word made up of three smaller words such as never-the-less??  And night-in-gale?
964752
The first three are correct.  I am having difficult finding an organism that is not somehow connected to an energy source.
363119
Haploid\nHaploid cells bear one copy of each chromosome.\n\nMost fungi, and a few algae exist as haploid organisms. Male bees, wasps and ants are also haploid. For organisms that only ever have one set of chromosomes, the term monoploid can be used interchangeably with haploid.\n\nPlants and other algae switch between a haploid and a diploid or polyploid state, with one of the stages emphasized over the other. This is called alternation of generations. Most diploid organisms produce haploid sex cells that can combine to form a diploid zygote, for example animals are primarily diploid but produce haploid gametes. During meiosis, germ cell precursors have their number of chromosomes halved by randomly "choosing" one homologue, resulting in haploid germ cells (sperm and ovum).\n\n\nDiploid\nDiploid cells have two copies (homologs) of each chromosome (both sex- and non-sex determining chromosomes), usually one from the mother and one from the father. Most somatic cells (body cells) of complex organisms are diploid
356064
A single cell from a snail is orders of magnitude more complex than the shuttle.  An easy way to think of it:  If we had never seen a shuttle before, but we were at the same level of technology we are now, how long would it take to figure out how the shuttle worked, and to reverse engineer an identical shuttle?  Now, ask the same question for a snail- We dont understand all the ins and outs of a cell yet, let along an entire animal...we can't even produce a bacteria, which is 1% the complexity of a eukaryotic cell.
523015
In my experience with creationists in my personal life and profession as a biologist, is that they know enough about evolution to know it is complicated.  Then, they stop and say it is too complicated, rather than try to understand.
906800
Why is it that a smart educated atheist like you doesn't know a fact of science a silly stupid christian like me knows?\nAlthough two chemical molecules may appear to have the same elements and similar properties, they can still have different structures. When two molecules appear identical and their structures differ only by being mirror images of each other, those molecules are said to have chirality. DNA develops a twist in the chain because each component contains chirality or handedness. It is this handedness that gives DNA the spiral \nshaped helical structure. If one molecule in the DNA structure had the wrong chirality, DNA would not exist in the double helix form, and DNA would not function properly. The entire replication process would be derailed like a train on bad railroad tracks. In order for DNA evolution to work, billions of molecules within our body would have to be generated with the "R" configuration all at the same time, without error. If it is impossible for one nucleotide to be formed with chirality, how much less likely would it be for billions of nucleotides to come together exactly at the same time, and all of them be formed with the same chirality? If evolution cannot provide a mechanism that forms one product with chirality, how can it explain the formation of two products of opposite chirality? Chirality is not just a major problem for evolution; it is a dilemma. According to evolution, natural processes must explain everything over long periods of time. \nHowever, the process that forms chirality cannot be explained by natural science in any amount of time. I know this isn't too deep for you because I am just a stupid theist and I understand it...\n\n\nJim
20498
This is a very complex process that forces cells to make commit to an end product while making sure not to allow any redundancies. The genes involved in this process are numerous, but the first to be identified are called the HOX genes. What's interesting about these genes is that they are conserved across a diverse number of species (invertibrates all the way up to mammals).\n\nSo to simplify, the cells of a blastula don't have any idea what they are going to be (face cell, brain cell or liver cell). They have to be told what they are going to be and this is done by the turning on of particular genes which determines the ultimate function of that cell. This selective expression of genes is determined by a complex sequence of events which is dictated by the genes such at teh HOX family of genes. I'm sure there are many other genes and gene families that are involved, but I've given you a couple of sources below that will elaborate. Interestingly, differentiation is a process that not only occurs in multicelllular orgranisms, it also happens in some single-celled organisms (such as the bacterium B. subtilis). I've give you link to the leading researcher in that area also. It may help to understand how things like this happen in its simplest form.
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.
569475
Yes, because one of the characteristics of life is the ability to replicate, or reproduce, and they definitely do that.  Another is the ability to move freely and independently, and they also do that.  Check the website below for other information.