Radioactive dating of trees

Scientists cannot tell the order in which bipedal posture and brain size evolved. She refuted hypotheses regarding the evolution of bipedalism and brain size. Scientists did not know that humans and apes were related before finding her. The methods are all based on radioactive decay: The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old.

Today, innovative techniques provide further confirmation and understanding of the history of life.

Which of the following specifically supports the idea that we share a common ancestor with other animals? Fossil evidence indicates that species have changed over time. Radioactive dating indicates that the Earth is over 4 billion years old. We have the same bone structure as other organisms. Individuals of different sexes from the same species can look different from one another. Why are bats skin flaps and birds feathers considered analogous to one another?

They are both used for flight, but are structurally different c.

New discoveries have filled in the gaps, and shown us in unimaginable detail the shape of the great ‘tree of life’.

Darwin and his contemporaries could never have imagined the improvements in resolution of stratigraphy that have come since 1859, nor guessed what fossils were to be found in the southern continents, nor predicted the huge increase in the number of amateur and professional paleontologists worldwide.

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