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No other animals are believed to have evolved from sponges, thus they win the title of "an evolutionary dead end."
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What is a pipe dead end system?
Its kind of joints pipe (branch) to the primairly pipe causing blockege due to cold weather (frozen) or due to debris and sluges accumalations
Does a bibliography come before thank yous?
Bibliography is a list of resources and is considered part of your work or investigation. You may want to write your thank yous at the very beginning of your essay or at the end, as a separate thing from the body of your work.
4 points to Darwins theory of evolution?
I presume the questioner requires 4 points of information about evolution.Four brief points are;1. Evolution is driven by natural selection2. The base unit of variation is the gene3. Charles Darwin was the original propounder of evolution4. Comparative anatomy and the fossil record can give clues to the evolutionary of today's extant organismsFour points is scarcely enough, so below is a little more background.Charles Darwin formulated the theory of evolution, suggesting natural selection as its driver. He delineated his ideas in On the Origin of Species in 1859.These days the theory of evolution gleans insight into the evolution of species by examining fossils, dating fossils, comparing anatomies and comparing nucleic acid sequences.The Theory of Evolution has managed to get this far in tracing the history of life.Life started in the ocean in the form of the simplest single cells. A likely theory is life started around hydrothermal vents. But whatever the abiogenetic origin of life, as soon as it could be defined as 'life' it began to evolve by nucleic acid mistakes in replication and mutations as such.Eukaryotic life branched from the main clade of life billions of years after the first life.The earliest animals were jellyfish and worms and sponges. Note that the sponge species today are not the same as those of the Precambrian Era. That is not how evolution works. The following illustrates, as a diversion, common misconceptions about evolution;Humans evolved FROM chimpanzeesThis is an incorrect statement. Chimpanzees are extant. Humans are extant. It was a human-chimpanzee common ancestor a couple of million years ago that humans and chimpanzees evolved FROM. It is due to the recentness in time from the divergence from the common ancestor of human and chimpanzee that the two are so anatomically and genetically similar.Thus, in the case of sponges - those sponges extant today are not the original sponges of the world. Sponges today evolved from the same common ancestor as humans, but this common ancestor was billions of years ago. This great time span has given time for animals to diversify and become more complex, explaining the complexity and vast phenotypic differences between sponges and humans. Sponges exist today as the spongeform (which was/is so simple that it could develop first of all among the animals) has been conserved throughout time (since their common ancestor), while the other offbranches - those that may have lead to echinoderms or annelids or sea squirts- changed within their own clades and since they were more complex than sponges, develped later.All life has a common ancestry. There was once a bacteria-archaebacteria-eukarya common ancestor. That was the first cell or couple of cells of all life. Evolution works by common ancestry. (We can trace this by modern phylogeny and taxonomy, grouping everything into their own groups called monophylies).Finally, a point on complexity. Obviously things have to start out simple and end up complex, or to put it better, to gain greater complexity as time goes on. But evolution's 'goal' is not to gain complexity. Evolution works by natural selection. Selction selects those characterists of organisms that CAN SURVIVE. Simple sponges can survive just as well as complex mammals or insects. So selection allows them to continue to exist.Evolution does not seek intelligence either. Intelligent organisms can simply survive a little better than a lot of other things. Intelligence is simply an attribute that allows organisms that acquire it to survive being weeded out by selection.In short evolution has no goal at all, which is why 'goal' is in inverted commas above.Still, admiring all species that survive today, that selection allows to survive because they CAN SURVIVE, one can still identify all species' beauty; Darwin's 'forms most beautiful'.
What is the primary mechanism that is responsible for evolutionary change?
Evolutionary change is generally a result of subtle morphological changes of an organism. These changes begin with genotypic mutations, often involving module duplication or deletion (a module being a unit on an organism that is easily adapted, such as segments, legs, or wings). If this change is adaptive (that is, it helps the organism survive), the gene will be passed on to the offspring (natural selection). Genetic mutations also help alter fully functioning features of organisms. For example, the ancient protein globulin originally existed in bacteria as a way to bind and carry oxygen. Over the centuries, mutations to the structure of globulin has expanded its role in organisms so that it functions differently in different tissue (e.g. muscle tissue versus fetal tissue)Essentially, evolutionary change can affect a protein's diversity in function, its frequency of expression, heterochromy (i.e. change in timing of developmental events, or the change in time of expression of a protein), allometric growth (i.e. change in rate or dimension of growth, such as wings versus limbs), and many other forms of adaptation. However, it is important to note that everything is determined by a combination of nature and nurture. By nature, I mean genetics, and the pathway of gene to RNA to protein. Genes are the blueprints for proteins, which are ultimately the building blocks for organisms. However, the environment (nurture) interacts with the ability for genes to produce these proteins through processes such as methylation (which essentially determines how accessible a gene is). Mutations can also cause genetic deletions, translocations, inversions, duplications (etcetera) which affect protein expression. These types of mutations are often seen in diseases like sickle cell anemia. A genetic mutation inhibits the ability of hemoglobin to form the appropriate protein structure for red blood cells. These types of mutations often involve a loss of function, although they may still be categorized as evolutionary change.In the end, evolutionary change is a constant, continuous process. To be cheesy: it's happening right now! :-)http://evolution.berkeley.edu/evolibrary/article/0_0_0/evodevo_05
When do you hand in a term paper?
term means end so at the end
What does genetic dead end mean?
A branch of evolutionary development that became extinct.
Why is the hummingbird at an evolutionary dead end?
There is no reason to think that the hummingbird is an evolutionary dead end. Granted, the hummingbird is an animal adapted to a unique niche, and a radical change in circumstances could mean the extinction of some of its species - but the same is true for many if not most lifeforms.
What causes biological dead end for an organism?
all biological enities are evolutionary experiments and will necessarily mutate but biological individuals are dead ends in the process.
What is the end result of the evolutionary process?
diversity
What is an amphidisc?
An amphidisc is a spicule with a denticulate wheel at each end, found in freshwater sponges.
What is the current status of Tiktaalik?
Tiktaalik, once touted as a proven ''missing link" is now regarded as an evolutionary ''dead end'', thanks to the recent discovery in Poland of tetropod tracks dated some 18Ma years older.
What are Sponges'?
Sponges are simple animals, and invertebrates. They are multicellular, but have no digestive, respiration, or nervous systems. A large number of pores are present on a sponge's body surface and indeed throughout their bodies, allowing seawater to circulate through the sponge's body cavities, providing food and oxygen to the cells.Sponges are mostly found in seas but a few are present in lakes, streams and rivers. They are attached to stones in their adult life. Sponges may reproduce sexually or by budding, and the sexual form may include free-swimming larvae.Sponges help clean the ocean. Some protect themselves with spikes that they have in their bodies. When they are dead and dried, they are good for scrubbing and cleaning.
Is the hair on your head dead?
Yes it is dead on the end of your head but is pushed out by the sacalp and the end of the head is dead...
What are some carnivores on the beach?
crabs, corals, sponges and some little small organisms more...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................end
How do you Use dead end in a sentence?
Working at that place is a dead end job.
When was Dead End Street created?
Dead End Street was created in 1982.
When was Dead End Run created?
Dead End Run was created in 2003.
