Whe did life seperate in to the plant and animal kingdoms ?

Question

These we know for sure...

1. we know the first 'life' emerged in the oceans
2. we know all life originated from common single-celled life forms
2. at some point of time, these sea-dwellers crossed the shore and slowly adapted to life on land.

question is.... when did plant and animal life became separate?

Did they separate before OR after the land-crossing ?

were there plants already on land when these life-forms came to land? definetly the complex animal life-forms that crossed shore did not evolve in to plants LATER. im guessing they were already on land...

so then, when did plants cross? did plants even start in the oceans as animals did?

or, dont we actually include plant life when we say "all life came from a common single cell forms" ?

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i had asked the question an year ago, here at Y! A, but the answers were quite lame... Now, with all the experienced members around i hope to get a decent scientific answer

Answer 1

the life originated from a single cell and life started in ocean.
slowly these cells for adaptation cause started dividing increasing its race , and prefrably adapting to weather conditions external factors etc. a point arrived where food could not be produced by al l the cells but only certain cells could.so plants originated then and thus our animal kingdom is formed

Answer 2

see the answer to your question lies in the endosymbiont theory... as you said it is possible that life in plant forms and the animal forms originated in the oceans because oceans alone could harbour the wealth of life sustaining compounds to nourish life and this is one main reason why water searching an important feature of any space exploration program... as a carbon based life cannot survive without water... coming to endosymbiont theory... it was believed that initial anaerobic organism or the prokaryotes were only utilising the cycles of glycolysis and the other primary oxidation mechanism to obtain energy... during the course of evolution a time came when prokaryotic photosynthetic and aerobic organism developed... the theory suggests that it would have the case that another prokaryote might have phagocytised these organisms to produce a symbiotic organism... the one which engulfed the aerobic organism in further generations produced the organisms with mitochondria while the ones which engulfed the photosynthetic organism developed the chloroplast in the later progeny... the later might have been the former`s progeny so that it developed both mitochondrion and chloroplast to form an aerobic photosynthetic organism... ! thus the secrret of animal and plant forms lies in this theory which clearly divide the plant and the animal kingdom at the very begining of the formation of the sub kingdom eukaryota... ! eukaryotic primitive plant forms like the forms of algae have chloroplast and the mitochondrion with the endomembtrane system... while the eukaryotic primitve animal forms do have the mitochondrion and the developed endomembrane system... ! the evidence for this theory however comes from the fact that both mitochondrion and chloroplat still harbour fragments of DNA in them which encodes for the matrix and the surface protiens on them while the division and and other related genetic affairs are related to the nuclear control... which clearly shows a symbiotic co relation between the organism and the organells like mitochondria and chloroplast... !

Answer 3

plant life diverged from animal life early in evolution. bacteria were first and they displayed characteristics that are present in animal and plant cells to this day. early bacteria had cell walls and some were photosynthetic. bacteria also had organelles that allowed motility. as evolution proceeded, bacterial cells became more complex and developed membrane bound sacks that performed specialized tasks. these organelles improved the efficiency of energy production. around the same time, these eukaryote cells fused with prokaryotic cells to form cells that had chloroplasts and mitochondria. photosynthetic algae were most likely a result of this fusion. much later individual cells started to clump together for protection from predators. these cells that formed into colonies became dependent on each other. eventually the colonial behavior of the cells affected the evolution of the individual cells such that they began to aggregate with the colony into areas where cells performed similar tasks and so you have the formation of organs and organisms.

at this point you have photosynthetic organisms and non-photosynthetic organisms. plants were the dominant life forms but were still bound to the ocean.

photosynthetic organisms need to be near light so plants colonized shallow waters. eventually plants made it onshore but not until they were able to support themselves by having cell walls.

animals or non-photosynthetic organisms relied upon the plants for food. therefore, when plants moved to land they moved to land.

lunged fish were the first to go to land and later developed into amphibians.

Answer 4

As per Jainism, Both plant and animal life are existing ever, there is no begining or end..only some speciecs seize to exist and new ones come to existence...It is like what science tells about Energy.."That energy cannot be created or destroyed..It can only be converted from one from to another.."

Answer 5

Because of
gods wish

Answer 6

the whole premise is false