In the beginning, all life evolved from the oceans. It started very small, then evolved to produce creatures, which were larger than life. First, there were plants and insects. Next which evolved were reptiles and fish. From those reptiles and fish came the amphibians. The amphibians were the predecessors to the first mammals. Evolution is the reason behind all of the changes witnessed by our planet.
All animal life on this planet started in the sea. Around three hundred and fifty million years ago the land on Earth was overran by plants and insects. All of the plants and insects on land were enticing to some adventurous fish. Some of these fish slowly evolved legs instead of their fins and lungs instead of gills so they could breath the air. The first types of species to make this migration to the land were amphibians. Amphibians are animals, which can live both on land as well as in the water. They are comfortable in both environments. .
Eventually reptiles began to evolve from the amphibians. This occurred around ten million years after the first amphibians. The first reptiles consisted of ancestors to the crocodile, dinosaurs, birds, and mammal like reptiles first started coming into existence. One of the major differences between the amphibians and the new reptiles is the development of the amniotic egg as well as stronger legs, and jaw muscles. The first reptiles split into two very distinct groups. The first group developed an aorta on the right side of the head. The second group developed an aorta on the left side of the head. The early reptiles also had no diaphragm, as well as their brain case was loosely attached. They had a continuous supply of replacement teeth, also their teeth were held in place by a single root.
The first mammals are believed to have evolved from the group of reptiles whose aorta developed on the left side of their head. The changes that went through for this new species of animal were pretty elaborate.
Reptiles surpassed amphibians on land because they had survival advantages. ... The evolution of reptiles to mammals varies slightly. ... Reptiles unlike mammals do not have a diaphragm. ... During the evolution of reptiles, the skulls developed openings which were called temporal fenestre. ... This type of egg is makes them different from amphibians. ...
EVOLUTION FACT OR THEORY We need to distinguish between theory and fact. ... Speaking on Mutations, they also cannot be used to explainsubstantiate evolution. ... The fossil record amply supplies us with representation of almost all species of animals and plants but none of the supposed links of plant to animal, fish to amphibian, amphibian to reptile, or reptile to birds and mammals are represented nor any transitional forms at all. ... This also makes evolution from mutations impossible. ... The theory of evolution teaches that simple life forms evolved into more complex life forms, suc...
There are 5 kinds of chordates in the world: fishes, amphibians, reptiles, birds, and mammals. ... Amphibians lay eggs in water or in a protected place where their moisture will be conserved. ... But some mammal are very different from other mammals. ... Mammals also have the backbone as other chordates. In conclusion, fishes, amphibians, reptiles, birds, and mammals are the 5 kinds of chordates that we know. ...
Personal Reflection on Why Evolution Is True Views on Why Evolution is True The book Why Evolution Is True, attempts to provide succinct and tangible evidence of evolution. ... What is Evolution? ... A good example is that fossils are evidential in supporting the view that fish ancestors emerged from amphibians and that dinosaurs have a close connection to birds. ... Learners question the fact that native species such as the amphibians, fresh water fish, mammals and reptiles exist in the oceans spheres. ... However, in support of evolution, is the view that mammals such as the aquatic seals an...
EVOLUTION OF THE HEART The hearts of primitive vertebrates apparently had only one atrium and one ventricle. Since their body temperature and metabolic rate fluctuated with the environmental temperature, they did not need as efficient a circulatory system as mammals and birds. ... As the primitive lung evolved in amphibians, two circulatory systems arose. The problem of mixing oxygenated and deoxygenated blood was resolved in a number of amphibians such as the FROG, in which the single atrium is divided into two separate chambers. ... Birds and mammals have completely separate chambers and hav...
By carefully examining what they have found and comparing it to other close relatives such as lizards, scientists have been able to construct a theory about their evolution. ... Snakes are thought to have evolved originally from a group of ancient amphibians knows as the labrynthodonts. ... Reptiles developed from these amphibians as a result of shelled eggs which were able to be laid on land and did not require water. ...
Change, such as evolution, and disturbance are a natural part of every ecosystem. ... Some ground-dwelling mammals and plants, once common in the woodlands, have become extinct (EPA, 2003). ... One species of amphibian is presumed extinct and 20% are considered threatened. ... Feral animals also become predators of many small mammals, birds and reptiles. ... Over the past 200 years 17 mammal species are thought to have become extinct here. ...
In their 1983 article entitled "The function of dream sleep", Francis Crick and Graeme Mitchison proposed a revolutionary theory of the function of dreams. They believed that dreams were not the veiled expressions of subconscious fears and desires, but were simply the byproducts of a fine-tuning of memory. Due to the limits of current research methods regarding the internal processes of the mind and dreaming, it is impossible to completely validate or refute any theory regarding the function that dreams serve. Therefore in order to evaluate this theory, only the plausibility of such a theor...
