Both organisms' DNA is sequenced, and then compared to one another. The number of nucleotide changes is literally counted (though with a computer). It is an estimate because of genetic diversity within a species
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By looking at different, small sections of DNA scientists can identify how many of them are shared exactly with another species and how far others diverge. The possibility of having the same genetic code due to convergent evolution, rather than it coming from a shared ancestor is so minute that scientists can say with a large degree of certainty how closely species are related
Scientists estimate the number of species on Earth using various methods, including species inventorying, ecological surveys, and genetic analysis. They often extrapolate from known species in well-studied areas to predict the number of undiscovered species in less explored regions. Additionally, statistical models and biodiversity databases help researchers infer species richness based on environmental factors and historical data. Overall, estimates suggest that millions of species remain unidentified, particularly among microorganisms and invertebrates.
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Megalodons are estimated to have lived between 23-3.6 million years ago during the Miocene and Pliocene epochs. It is believed that they went extinct around 2.6 million years ago. Their estimated lifespan is difficult to determine precisely, but it is thought to be similar to that of modern-day great white sharks, around 30-70 years.
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common ancestor by comparing the differences in their DNA sequences. By measuring the rate of mutations in DNA sequences over time, researchers can estimate how long ago two organisms diverged from a common ancestor. This provides insights into the evolutionary history and relationships between different species.
A molecular clock measures the rate at which genetic mutations accumulate in a species over time. By comparing differences in genetic sequences, scientists can estimate how long ago different species diverged from a common ancestor.
The molecular clock relies on the idea that mutations in DNA accumulate at a relatively constant rate over time. By analyzing these mutations, scientists can estimate the time at which different species diverged from a common ancestor.
"Molecular clocks" can be used to estimate the time at which two lineages diverged. Often, the calibration of the clock uses fossil evidence to gauge a timeframe for the existence of a common ancestor of a number of lineages. From this, an average mutation rate can be calculated. This average mutation rate can then be used to estimate the timeframe for further branching points in the genealogy of the lineages in question.For instance, fossil evidence could be used to establish a timeframe for the existence of a common ancestor to all great apes. By dividing the sum of all differences in a particular genomic sequence for all great apes by the time between then and now, we get an average rate. We can then take the differences between that genomic sequence in men and Neanderthals to estimate when Neanderthals diverged from us.
Molecular clocks use the rate of genetic mutations to estimate the time since species diverged from a common ancestor. By comparing the differences in DNA sequences between species, molecular clocks can provide insights into the timing of evolutionary events.
Molecular clocks are typically calibrated by comparing genetic mutations or fossil records to estimate the rate at which DNA changes over time. This helps scientists determine how long ago species diverged from a common ancestor.
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A molecular clock relies on the repeating process of DNA mutations occurring at a relatively constant rate over time. By measuring the differences in DNA sequences between species or individuals, scientists can estimate when they diverged from a common ancestor. This provides insights into evolutionary relationships and the timing of key events in evolutionary history.
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Molecular clocks are used to estimate the timing of evolutionary events by comparing DNA or protein sequences between species. They assume that mutations accumulate in a relatively constant manner over time, allowing researchers to estimate when different species diverged from a common ancestor. Molecular clocks are valuable tools in studying evolutionary relationships and the timing of key events in the history of life on Earth.
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