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Which step in the evolution of life is the most complex and probably occured last?
Answer 1We used to think intelligence represented by brain growth and complexity. Recently it has been found, in the cephlons of early trilobites, that complex brains reached back into the Cambrian.So, I am now at a loss to tell you what step was most complex and probably last.Answer 2Most evolutionary biologists will agree that the most complex evolutionary "step" was the emergence of multi-cellular lifeforms.I say "step", because like all evolutionary developments, it wasn't exactly a leap, but more of an incremental development, taking place over many millions or even billions of generations. It took Earth life approx. 3 billion years to go from single celled replicators to true multicellular organisms, although colony organisms - temporary conglomerations of many single celled organisms - evolved after only about a billion years.It is, according to many researchers, entirely possible that Earth-like planets could exist on which true multicellular life would never evolve.Of course it is impossible to gauge probabilities, since we do not have a complete understanding of the processes involved just yet, and we have no basis for comparison: our sampling space consists of one example, and one example only: Earth.
Why have organisms been reclassified?
Now taxonomy have become an advanced field . New methods are being developed to investigate and interpret relationships among organism and groups . Cladistic analysis has changed classification and in some instances revolutionized it , for example Reptiles and Birds are being classified as on class .
Why are bacteria often used in biological studies?
They are less complex and their genomes are easily manipulated. The plasmids in bacteria provide an oppertunity for simple genetic recombination exercises. Bacteria can be easily made to be lab dependent so that if an accidental release occured there would be no contamination because the bacteria can not live outside the lab environment.
What has most likely occured if a chromosome lacks certain genes?
If a chromosome lacks certain genes, it is likely due to a genetic mutation or deletion event that occurred during DNA replication or recombination. This can lead to genetic disorders or abnormalities depending on the specific genes that are missing.
A nucleid acid changes from ATTCGG to ATCGG WHAT OCCURED?
A substitution mutation occurred in the nucleic acid sequence, where the base pair T was replaced with C at the second position. This type of mutation is known as a point mutation, specifically a transition. It resulted in a change from ATTCGG to ATCGG in the sequence.
What event occured that allowed single celled organisms to evolve into more complex organisms at the end of the precambrian time?
the ozone layer began to develop shielding earth from ultraviolet rays, this was hypothesized that these changes allowed species of single celled organisms to evolve into more complexed organisms
What was a major change that occured on earth during the Precambrian era?
During the Precambrian era, a major change was the emergence of photosynthetic organisms, particularly cyanobacteria, which significantly altered Earth's atmosphere by producing oxygen. This event, known as the Great Oxygenation Event, occurred around 2.4 billion years ago and led to the gradual accumulation of oxygen in the atmosphere. This increase in oxygen levels paved the way for the evolution of more complex life forms and fundamentally transformed Earth's ecosystems.
What major changes life-forms occurred at the end of Precambrian time?
what major change in life forms occured at the end of precambrain time
What major change in life-forms occurred at the of Precambrian time?
what major change in life forms occured at the end of precambrain time
What major change in life-form occurred at the end of the Precambrian time?
what major change in life forms occured at the end of precambrain time
The invention of writing system and the growth of cities occured only in civilizations that?
Developed complex institutions
Which early Precambrian era converted to oxygen?
The Great Oxidation Event occured during the Proterozoic Eon around 2.4 billion years ago. This event led to a significant rise in atmospheric oxygen levels, marking a major turning point in Earth's history.
What was the climate like in precambrian times?
That's a very long timetable from 4,500, 000,000 years ago right up to 542,000,000 years ago, a total of 3,958,000,000 years.From low surface temperatures, with extensive glaciation to warm temperate conditions and no glaciation, which seemed to have occured in cycles over that time period.
How can someone tell when equillibrium in a reaction has occured?
Equillibrium in a reaction has occured when the concentration of compounds remain unchanged.
What is the synonym for if?
Had (a scenario) occured,...
What is the synonym for occured?
applied
Why do some kinds of organism live where no others can?
Many organisms are especially adapted to certain conditions, such as a high or a low temperature, a life in water, a life away from water, etc. Pressumably these changes occured as a result of evolution.
