Question

What are fossils how fossils formed and how is your age determined state the importance of fossils in study of evolution

Answer 1

$\bold{\huge{\boxed{\purple{FOSSILS}}}}$

★★A fossil is the naturally preserved remains or traces of animals or plants that lived in the geologic past. There are two main types of fossils; body and trace.

★★Fossils are formed in a number of different ways, but most are formed when a plant or animal dies in a watery environment and is buried in mud and silt. Soft tissues quickly decompose leaving the hard bones or shells behind. Over time sediment builds over the top and hardens into rock.

★★The four types of fossils are:

•mold fossils (a fossilized impression made in the substrate - a negative image of the organism)

•cast fossils (formed when a mold is filled in)

•trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)

★★Scientists combine several well-testedtechniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actualages of certain types of rock to be calculated.

★★Fossils represent the remains of once-living organisms. ... The kinds of fossils found in rocks of different ages differ because life on Earth has changed through time. Darwin's theory of evolution accounts for all of the diversity of life, both living and fossils.
•Fossils help in establishingevolutionary traits among organisms and their ancestors.
•Fossils help in establishing the time period in which organisms lived.

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