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☆☆☆☆☆to produce offspring with spotted bodies
both Macroevolution and Microevolution
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Just off Iceland in 1963, a brand new island formed, Surtsey, and the arrival of new life on this volcanic land has been well documented.
On the more general front, when a new population arrives on a land, then the main source of genetic information is restricted to those few individuals.
So the arrival of new varieties or the development of a new species is a normal circumstance.
Had those same individuals arrived on a land where many of their species already existed, then their diversity, if any, would be swamped by the existing population.
Indeed, if the new arrivals were different from the existing population, then they may well be shunned or isolated.
Once these populations adapt to the environment, however, speciation rapidly occurs.
global cooling 2.8 million years ago resulted in dry grasslands replacing wet forests in parts of Africa.
many new species often appear at the same time
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How did the separation of Earth's continents affect biological evolution?
To perform a testcross, scientists cross an organism with an unknown genotype with a _____ organism.
Adaptations result from interactions between organisms and their _____.
macroevolution
allele frequencies
