2. How did fossils contribute to Darwin's ideas about changes in species over time?
Oa. Fossils supported Darwin's ideas about
common ancestry and the relationship of
living species to fossil species.
Ob. Fossils showed that all species are the result
of gradual changes over time.
c. Fossils explained how species develop
different traits.
Od. Fossils showed how humans had affected the
traits of organisms for thousands of years.
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B. Fossils showed that all species are the result of gradual changes over time.

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b) Fossils supported Darwin's ideas about

common ancestry and the relationship of

living species to fossil species.

Explanation:

Fossil remains have been found in rocks of all ages. Fossils of the simplest organisms are found in the oldest rocks, and fossils of more complex organisms in the newest rocks. This supports Darwin's theory of evolution, which states that simple life forms gradually evolved into more complex ones.

Common ancestry allows Darwin to infer what happened in the lineage leading to modern mammals. The fact that present day birds and reptiles have sutures but no live birth is evidence that sutures were present in the lineage leading to modern mammals before live birth evolved.

Fossils showed that all species are the result

Fossils showed that all species are the resultof gradual changes over time.

Fossils. Fossils provide solid evidence that organisms from the past are not the same as those found today; fossils show a progression of evolution. Scientists determine the age of fossils and categorize them all over the world to determine when the organisms lived relative to each other.

Fossils explained how species develop

Homologous features

Homologous features If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor. Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.different traits.

Fossils showed how humans had affected the

Fossils showed how humans had affected thetraits of organisms for thousands of years.

Evidence for early forms of life comes from fossils. By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind.

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