why is triploblasticity considered advanced than dipoloblasticity?
97520
Diploblastic organisms require each and every cell in the organism to be adjacent to both a source of food and an appropriate area in which to excrete waste products.  Such considerations are not required in triploblastic organisms.  In order for triploblastic organisms to fully exploit their advantage over diploblastic organisms they must develop internal organs to manage the food, gas and waste removal requirements of their internal cells.  This drive for systemic complexity within triploblastic organisms promotes advancement and the development of separate organ structures.\n\nBy the way the words you mentioned in your question are defined as follows (they are not all relevant to this question)\n\nCoelom – This is a cavity in the mesoderm running parallel to the gut in which organs will develop\nMesoderm – The middle germ layer found only in triploblastic organisms\nGerm layers – The two (in diploblasts) or three (in triploblasts) layers of cells present in developing embryos\nCephalisation – The state of having main sense organs proximate to the main processing centre for an organism (i.e. you exhibit cephalisation as your eyes, nose, ears, and tongue are very near your brain)\nSymmetry – Does what it says on the tin!
446873
by primitive and advanced, a paleontologist doesn't mean the same thing as one normally thinks of when you hear 'primitive' or 'advanced'.\n\nPrimitive means closer to the ancestral form, unmodified from that which has been inherited through phylogeny.  A more proper term would be plesiomorphic.  Two groups which share a plesiomorphic trait, such as five fingers, would be synplesiomorphic, suggesting that those lineages inherited the trait from a common ancestor.  For example, bats, humans, tree frogs and monitor lizards would share the synplesiomorphy of five digits on the forelimb.  This trait can be traced back to the Rhipidistian Sarcopterygian fish.  Primitive does not mean inferior, only that it has not been modified from the ancestral state.\n\nAdvanced, derived or synapomorphous traits are ones that have been modified from the ancestral condition.  The two digits of the T. rex are highly derived from the original five digit condition.  So is the two foreclaws possessed by the two-toed sloth.  These traits, although highly derived, so not share a similar phylogenetic origin.  They also are not necessarily superior to five gigits, or 'more evolved', they are simply an adaptation in that lineage that has taken place that is different that the adaptations that earlier organisms in that lineage possessed.\n\nThe reason we (and all tetrapods) have five digits as a primitive trait is due to the fin structure of that first fishie that started wandering out on land and becoming the first amphibian.  Those Sarcopterygians had a number of bony ossicles in their loby fins that helped provide some support to their fleshy fins as they pushed their way onto land.  It just happened that those ossicles were arranged in more or less five rows, and these rows eventually became adapted to become the digits of our ancestral amphibian great-grandparents.  Had we evolved from the Actinopterygians (ray-finned fish), perhaps we'd have thirty or forty fingers.  Who knows?
1035532
In the pharmaceutical industry, the precipitation of active pharmacuetical ingredients to their solid form is very key.  This is because the different solvents and or precipitation conditions can potentially form different polymorphic forms (they can pack in different repeatable patterns when precipitating) that can be redissolved differently and even have different melting points.  The importance of this is that each polymorphic form can be patented independently which essentially for lisencing purposes makes it a new drug free of patent restrictions since its redissolution properties are most likely different (which is related to drug delivery in vivo).\n\nThe overall purity of a product can be changed by altering the precipitation conditions.  The goal is to find a set of conditions that are most selective to the molecule of interest over undesirables.
1008643
I actually asked an inorganic chemist the very same question, and this is what he told me:\nI seperated out the section that I thought was the best reason he gave, and I think it's important to read the last paragraph.  His other reasoning seems good, too.  I'm not trying to say it doesn't make sense.  I just think the part I seperate is probably what they had in mind when designating the groups.\n\n When you say they are put into the same "group" I assume you mean the group B numbering within the transition metals columns, which would make the Fe, Co and Ni triads all part of group VIIIB.  Now with the main group, also termed group A, the significance of the roman numeral to signify the standard oxidation state of the element is obvious.  The oxidation states get more complex in the transition metal series and frequently multiple oxidation states are observed.  The Cu triad (Cu, Ag, Au) is termed IB due to stable +1 states that are common especially silver which is only found as elemental or +1, where copper may alos be found as a +2 and Au may be found as +3.  The Zn triad (Zn, Cd, Hg) are exclusively +2 and are thus labled IIB group.  You then skip back to the begining of the transition metals and number across due to stable +3 and +4 for Sc triad and Ti triad respectively.  There are a few reasons why in the classical B grouping Fe, Co, and Ni are lumped into a "group" in the middle of the transition metal series.  First as you go across the transition metals the +2 state is becomeing continuously more stable and prevalent.  For Fe there are several oxidations states that are common, however +2 and +3 are most stable and common.  When you move over to Co the +2 becomes the dominant oxidation state with +3 also commmon and very rare examples of higher oxidation states.  When you move over to Ni it is almost exclusively +2 or +3 with rare exceptions.  The second point that I would consider in grouping them together would be their adherence to the 18 elecron rule.  These elements in the middle of the transition metall series follow the rule almost always where earlier elements frequently violate the rule with lower electron counts or even odd number counts and the later elemnts are frequently content with 16 or even 14 electron counts, the later condition is common for group IIB.  \n\n\nAnother consideration to give this group the lable VIIIB is the d8 configuration that is common (Fe(0), Co(I), and Ni(II)) are all d8 systems and frequently analogous compounds can be made with the different metals.  \n\nI hope this shed some light on your question.  I also should note that the system that groups these elements together is an older group numbering system and the new and current grouping system avoids the grouping by groups A and B and simply numbers across the table from 1 to 18, with groups 3-12 being the transition metals.
700100
Many other materials can be in three states. It depends on the temperature!\nNear the 'triple point' the three phases exist together.\n\nTh
105477
Do you mean Tri-Luma? You can find out more at:\nwww.triluma.com
446916
It differs depending on whether you are speaking of parallell or perpendicular to the surface\nand\nat what temperature it is\n\n8 > 36(10-^6/K)   {@ 0 - 1000°C}\n\nparallel and lower temperatures = lower CTE\n\nCoefficient of expansion per °C parallel to cleavage:\n  0° > 200° C *  8x10^-6 >  9x10^-6\n200° > 500° C * 10x10^-6 > 12x10^-6 \n\nCoefficient of expansion per °C perpendicular to cleavage:   \n 20° > 100° C * 15x10^-6 > 25x10^-6\n100° > 300° C * 15x10^-6 > 25x10^-6\n300° > 600° C * 16x10^-6 > 36x10^-6
11244
All are true except that each atom is bonded to four others.  Carbon's valence is four, and so it can only form four bonds--by having double bonds, there is no room to bond to four atoms.  Diamond, on the other hand, has each carbon atom bonded to four other atoms, but no double bonds.\n\nGraphite forms in sheets, with no covalent linking between pifferent sheets.  That is why it is so soft.\n\nthe picture on the second link does not show the double bonds, but if you pick a single direction and regard all parallel bonds in that direction to be double bonds, the valence states will make sense.
364473
Already been done.\n\nBased on current observable evidence, there is increasing perenctages of certainty regarding the timeline and history of the development of life on our planet.\n\nIt doesn't exclude G-d. It just outlines the observable and measurable properties of the phyiscal evidence.
649874
Nope, it's answer A.  The first compound in D has two chlorines on it, not a chiral compound.
1034783
'False' rainbow or secondary one forms because of TOTAL INTERNAL REFLECTION through the optical medium (which probably is the rain drops). Total internal reflection can be understood like this: sine of angle of refraction equals sine of angle of incidence into the refractive index. So, when u kep on increasing the angle of incidence, the angle of refratction also keeps on increasing till when a point comes when it esceeds 90 degrees, i.e., when the refracted ray moves back out of the refracting surface (apparently reflected), and one gets an inverted image, hence the sequence opposite of VIBGYOR. Bye. Hope this helps.
179545
Wow, that last person used way too much stuff.\n\nDraw in one diagonal of parallelogram ABCD, say BD.  You have congruent angles ABD and BDC, ADB and DBC because they are alternate interior angles and BD is congruent to itself.  The two triangles are congruent (ASA) which makes the parts you want congruent by CPCTC.
1173968
It is correct that the visible wavelengths of electromagnetic radiation  are from 400nm (violet) to 700nm (red); but that is because of the way the eye perceives light, and has nothing to do with the way waves interact with each other.  Also, because of the way the eye sees color (and not due to the nature of the waves) many colors can be produced either by a  single wavelength of a combination of two or more wavelengths.  For additive color reproduction three primaries are selected (red, blue and green) because they produce the widest range of other colors (gamut), probably because of the way the eye works.  Other primaries can be used, but they will result in a more limited range; also more primaries can be added to increase gamut.  How selected primaries are combined to create other colors is shown in the "CIE color chart".
591818
Diploblasty is a condition of the ovum in which there are two primary germ layers: the ectoderm and endoderm. Diploblastic organisms are organisms which evolve from such an ovum. Diploblastic animals include radiata.\n\nTriploblasty is a condition of the ovum in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. Additionally, the term may refer to any ovum in which the blastoderm splits into three layers. In higher and intermediate animals, all organisms arise from a triploblastic ovum. Triploblastic organisms are organisms which evolve from such an ovum.
324324
Do you mean triploid? It's 15.
125798
2p, 5d, 4d, 3p, 3d exist.
702252
I think its 3 to one since blue is a recessive trait compaired to brown or any other darker eye color since eye color is a mix of pigment and pattern.