Customer reviews Casual Casual transition words show the relationship between sentences and paragraphs, where the proceeding point emerges as a cause or effect of the previous. Some words in this category are: Consequently, as a result, due to the fact that Therefore, thus, otherwise For, since, unless You can easily identify casual transition words by looking at the relationship they create between two sentences or paragraphs.
Transitions of Reptiles to Mammals A long Thesis essay transitions time ago, in a galaxy not too far away, was a little blue planet called Earth, and on this world not a single mammal lived.
However a lot of time has past since then and we now have lots of furry creatures that are collectively called mammals. How did they get their?
Where did they come from? These are the kinds of questions that led me to my subject Thesis essay transitions choice. I will endeavor to provide examples, using specific transitional fossils, to show that mammals have evolved from a group of reptiles and were simply not placed here by unknown forces.
Before I begin, I would like to define some terms so that nobody gets left in the dust. The term transitional fossil can be used in conjunction with the term general lineage, together they help explain the how one species became another.
This is a sequence of similar genera or families, linking an older to a very different younger group.
Each step in the sequence consists of some fossils that represent certain genus or family, and the whole sequence often covers a span of tens of millions of years. A lineage like this shows obvious intermediates for every major structural change, and the fossils occur roughly but often not exactly in the expected order.
However, usually there are still gaps between each of the groups. Sometimes the individual specimens are not thought to be directly ancestral to the next-youngest fossils e. However they are assumed to be closely related to the actual ancestor, since the have similar intermediate characteristics.
Where Does It All Begin? Mammals were derived during the Triassic Period from to million years ago It began with relatively warm and wet conditions, but as it progressed conditions became increasingly hot and dry.
The therapsids, members of the subclass Synapsida sometimes called the mammal-like reptiles ,generally were unimpressive in relation to other reptiles of their time. Synapsids were present in the Carboniferous Period about to million years ago and are one of the earliest known reptilian groups.
Although therapsids were primarily predators by nature, some adaptations included a herbivorous species as well, they were generally small active carnivores.
Primitive therapsids are present as fossils in certain Middle Permian deposits; later forms are known from every continent except Australia but are most common in the Late Permian and Early Triassic of South Africa.
The several features that separate modern reptiles from modern mammals doubtlessly evolved at different rates. Many attributes of mammals are correlated with their highly active lifestyle; for example, efficient double circulation of blood with a completely four-chambered heart, anucleate and biconcave erythrocytes blood cellsthe diaphragm, and the secondary palate which separates passages of food and air and allows breathing during mastication chewing or suckling.
Hair for insulation correlates with endothermy being warm-bloodedthe physiological maintenance of individual temperature independent of the environmental temperature, and endothermy allows high levels of sustained activity.
Transitions to New Higher Taxa Transitions often result in a new "higher taxon" a new genus, family, order, etc. There is nothing magical about this. The first members of the new group are not bizzare, they are simply a new, slightly different species, barely different from the parent species.
Eventually they give rise to a more different species, which in turn gives rise to a still more different species, and so on, until the descendents are radically different from the original parent.
They looked more like small, dumb foxes with raccoon-like feet and simple teeth.
But over the following tens of millions of years, the descendents of those animals became more and more different, and now we call them two different orders. Major Skeletal Differences derived from the fossil record The mammalian skeletal system shows a number of advances over that of reptiles.
In reptiles each long bone has a single centre of ossification, and replacement of cartilage by bone proceeds from the centre toward the ends. In mammals secondary centres of ossification develop at the ends of the bones.
Mammalian skeletal growth is termed determinate, for once the actively growing zone of cartilage is used up, growth in length ceases. As in all bony vertebrates, of course, there is continual renewal of bone throughout life.
The advantage of secondary centres of ossification at the ends of bones lies in the fact that the bones have strong articular surfaces before the skeleton is mature. In general, the skeleton of the adult mammal has less structural cartilage than does that of a reptile.
The skeletal system of mammals and other vertebrates is broadly divisible into axial and appendicular portions. The axial skeleton consists of the skull, the backbone and ribs, and serves primarily to protect the central nervous system.
In addition, there are skeletal elements derived from gill arches of primitive vertebrates, collectively called the visceral skeleton. Visceral elements in the mammalian skeleton include jaws, the hyoid apparatus supporting the tongue, and the auditory ossicles of the middle ear.
The postcranial axial skeleton in mammals general has remained the rather conservative during the course of evolution. The vast majority of mammals have seven cervical neck vertebrae, and do not have lumbar ribs, both characteristics are unlike reptiles.Nov 10, · Furthermore, in a longer work like a master’s thesis, to transition well full paragraphs are sometimes necessary.
Remember, in academic writing you always need to be as concise as possible, but you also need to be as clear as possible. If you can’t transition clearly in a word, use a phrase/5(25). #PERSUASIVE ESSAY LONGER LUNCHES #Conclusion Transition Words For Argumentative Essays #SPORTS ON TELEVISION ESSAY #PROFESSOR KELP DECIDES TO WRITE A PROCEDURE #DESCRIPTIVE ESSAY EDITING FOR HIRE UK.
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“Transitions and Coherence” Please respond to the following: From Part 6: Readings for Writers in the course textbook, state the name and author of the essay you read.
Using the document titled “ Types of Transitional Expressions ”, by clicking this link, identify at least three (3) specific transitional expressions that the author used.
Oct 06, · Nvq Unit Supporting Children Through Transitions Essay Unit Supporting years Transitions are periods of change which generally involve a loss of familiar people in a child’s life.
Narration Narrative paragraphs/essays are often a chronological (make contain flashbacks). Adolescence & Transition Adolescent development does not necessarily follow a similar pattern for every individual as the multidimensional phase spans through in a quite complex way. At a time of transition from childhood to adulthood traditionally, a period of rapid physical growth is flung upon the individual amidst brief periods of remission.