LIFE SCIENCE

Detailed explanation-1: -Across a broad range of species, the research found that for a major change to persist and for changes to accumulate, it took about one million years.

Detailed explanation-2: -But these changes don’t persist. It takes a million generations or more to evolve lasting changes, the study found. Darwin was right: natural selection is beavering away all the time, and yet evolution itself plods along like a stick-in-the-mud.

Detailed explanation-3: -Evolution has no single schedule. Sometimes, new species or varieties arise in a matter of years or even days. Other times, species remain stable for long periods, showing little or no evolutionary change.

Detailed explanation-4: -All organisms, including humans, evolve over time. Evolution occurs through natural selection, and is a force that has shaped every organism living today.

Detailed explanation-5: -Because for many species, humans included, evolution happens over the course of many thousands of years, it is rare to observe the process in a human lifetime.