Till a billion years ago life was mostly microscopic nearly one twentieth of a millimeter. When life forms became visible and abundant after this date, they broadly fall under two categories: fixed or immobile and mobile or moving. The moving organisms—all animals—trespass the gravitation of earth by their own strength. Consciousness per individual in such a system is higher than the fixed type. Fixed forms face perils out of environmental destabilisation because they cannot move. Running away and saving one-self from dangers seems to be the main factor behind the evolution for movement but it also helped food gathering and better survival. Initially the locomotion potential was low as in the annilids. However, in forms like insects, birds or mammals the motion has been considerably accelerated through appendages.

In the geological records, Ediacaran Period marks the beginning of visible trace fossils around 625 million years ago (Ma). They relate to slow movers, soft bodied animals like earthworms of today. The body fossil record of animals begins with the Cambrian period commencing around 590 Ma. An illustrated account is provided for appreciating the pattern of life during 500 to 700 Ma. Most significant development during the period is commencement of skeleton in the organic world. The skeletal element includes mostly calcium compounds. Thus the life which was made basically of organic compound only, imbibed in itself, a new element calcium in the construction of physical body. This skeletal element added greatly to the locomotion in the later ages besides acting as a protective sheet of brain among the brainy vertebrates. Earliest relatives of vertebrates with low calcareous skeleton are seen to emerge during the Cambrian Period.

Evolution of sense organs is a feature among animals to exhibit their response to external stimuli. Touch, among them is first to be appreciated at the interface of body and environment. Appearing at the unicellular stage, it continues among the higher forms of life. The next organ to develop among animals is sensitivity spot for light first seen among jelly fishes. This turns into eyes among annilids and later forms. Taste and smell develops subsequently at the level of arthropods and shared well by the vertebrates. Hearing is rare among invertebrates though some insects posses this faculty. It is more common among vertebrates.

A comparison of sense and locomotary organs among fast moving invertebrates like dragonflies and birds among vertebrates shows a parallel development of skeletal and brain components. Among insects it is an organic exoskeleton with very small, solid, knot-like brain; in the vertebrates, movement is on account of calcareous endoskeleton and synchronisation is done by a large hollow brain. There is a difference between the invertebrate and the vertebrate body plans also. The former contains a digestive sack covered by muscular body sheath. Brain is but a small knot. The latter contains, besides the two, a brain sack related intimately to consciousness. Consciousness and calcium covered brain-sack have a distinct beginning among the chordates where the brain has evolved ultimately, after 57 Ma, into that of a yogi who has the potential to visualize experientially that the consciousness-body of the man lies beyond this physical self.

The cranial system with nerves emanating out of it, is a new unit in the animal world higher in status than food sack and muscular system of the body as possessed by the invertebrates. It has the potential of controlling and commanding the visceral and somatic systems of the body. If it 'felt' hungry, it directs the body to move and search food, eat and nourish itself. If in danger, mind commanded the body to move away. It is at this stage of the Cambrian revolution of consciousness that chordates acquired a definite 'I-ness' or 'self' emerging out of the brain sack. Vertebrates differ from invertebrates in possession of an 'I-ness' component in their consciousness. Also the locomotary organism the chordates are linked intimately to the brain-sack and its activity.

Evolution, in a three tier chordates animal had three option since Cambrian. First, enhancement of visceral and suppression of somatic and cranial segments; second, exaltation of somatic and suppression of visceral and cranial parts; and, third, expansion of cranial element and suppression of somatic and visceral components. All the three options are seen among living chordates. Sea-squirts, sharks and a man are the examples in respective categories.

In the vertebrate phylogeny, as simplified by rock records, fishes were first to arrive by 425 Ma, followed by Amphibians (355 Ma) and Reptiles (330 Ma). Reptiles gave birth to mammals (222 Ma) and birds (145 Ma). Among mammal the brainy ones or primates, including the man, arrived as late as 57 Ma. The nearest ancestors of man like Sivapithecus or Ramapithecus step into the geological record merely eleven or twelve million years ago. From Ramapithecus emerged Australopithecus around 4 Ma and then Homo or man around 2 Ma.

A gradual increase in the size of the brain case or cranium is seen between Australopithecus (500 cc) and man, reaching its acme in the now extinct Neanderthal (1550cc). Cranial volume and intelligence, however, are erroneously correlated. It is seen that brain of 1550 cc Neanderthal was no more intelligent than 1470 cc brain of modern man. Even among living man, the one with 1200 cc brain regards himself as much human as the one with 1600cc. Intelligence has no difference between the two. Cranial capacity building in man is, accordingly, has little role after 1200 cc.

Mental potential to understand simple words and commands exists even in Chimpanzee. What this ape lacks, however, is word power in a social frame to communicate with others of its species through sentences. Study of Broca's areas in the brain-casts of fossils specimens suggests that speech has arrived in the Australopithicus-Homo lineage between 2.5 and 1.6 Ma when his cranial capacity was 750 cc. From here onwards any man irrespective of racial type said in his own language "I am a man". Facial morphology or cranial cubic capacity became redundant at this date.

Some works suggest relationship between tool making, vocabulary and intelligence. Seemingly it has little relevance because tool making potential has no relationship with complex brain-work in vocabulary building. Vocabulary involves a group activity relatable to knowledge-building about surroundings. There are examples to show that words current in the two tribes with same meaning have joined as syllables of a new word when they interacted and many words have expanded by combination of more than one chord as syllables. Tools have remained same, however.

As a species, man is not a morphological form. It is a knowledge and language based species. When he said 'I am a man' or 'mi onge' in the Andamanese morphological distinction between an Europoid Cranium and Negrito Cranium is invalid because the identification of man lies with 'I-ness' and not with the physical body as in other animals. As a self identifying species, defined by words and knowledge, man opens his record with Homo habilis. Morphological changes have continued in the population irrespective of word or knowledge building potential since 2 Ma. This knowledge has travelled far and wide due to interaction of men's mind during migration from one place to another. It is unrelated to his morphological type.
Some emerging trends of the human mind are semaphoric of the real direction of evolution of the human consciousness. Traits like Indian rope trick, spoon bending of Geller, photographs of Ted Serios, prediction of Cheiro and several accounts of life before life are the features of consciousness emerging in man lately and still not common to the whole species. These are some of the initial traits of an evolving human consciousness in the new direction.

The consciousness which remained tied to the animal body in the lower humans has very lately emerged independent of sense organs and body. A yogi perceives in samadhi that he is not a physical body but lies beyond 'I-ness' of the physical self. He is a brahm This is what the 'knowledge-sack' of the Cambrian has attained as the terminal evolution of consciousness, during the past six hundred million years.

A survey of major events of extinction among animals shows a direct jump of consciousness among the vertebrates after every major extinction. When visceric animals recede at after the extinctions at the Paleozoic/Mesozoic boundary the somatic animals acquired dominant role. They became extinct at the Mesozoic/ Cenozoic boundary after attaining gigantic sizes among dinosaurs, weighing above 40,000 Kg. The man has reached to the status of yogi when large woolly mammoths and other animals disappear around 15+-5 Ka.

Colonization in the human species, on account of its being a mental population, is characterised by the mental parameters. In man, role of individual animal in a colony has been taken up by individual mindset embedded in a mega-mindset of a community. This in turn, is based on religion, culture or language. Mental colonisation has its own role in the human evolution and shaping the destiny of man. His status is now exactly same as that of a bee in a beehive .