Evidence supporting the theory

11 important questions on Evidence supporting the theory

Where is the evidence supporting the theory of evolution based on?

on evidence from fossils, homology, ebryology, genetics and observed natural selection

When is sedimentary rock formed?

When more and more layers are deposited, eventually sedimentary rock is formed because of the pressure from above that squeezes the sediment into layers.

Do hard or soft parts of organisms fossilize better?

Hard partss, such as shells nd bones. This is hwy more shells have been ound than worms.
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What do the fossilized parts help us with?

to reconstruct the appearance of the organism

How can the layers of rock be dated?

by the types of fossils they contain. Scinetists have determined the relative times of appearance and disappearace of many kinds of orgaisms from the location of their fossils within the sedimentary rock layer.

What do fossil findings indicate?

Fossils findings indicate that throughout evolution species appeared, changed and /or disappeared.

What is similar bone structure?

• Similar bone structure.
– Organs having different functions can show similarity in structure. Examples: a bat’s wing, the front flipper of a whale, the front leg of a mole and a human arm.
– These organs most likely developed from the same structure in an ancestral species. The distinctive forms result from adaptation to the environment.

What are rudimentary organs?

• Rudimentary organs: organs without any function and which hardly develop or not at all.  (once necessary for survival)
– Examples of rudimentary organs: the whale’s pelvis, the legs of a python, the human tailbone and appendix. These organs do develop in related species.
– The presence of rudimentary organs makes it highly probable that different these organisms have a common ancestor.

What does the development at the early stage of embyonic development  in vertebrates show?

The similarity they have. This supports the idea that vertebrates have a comman ancestor.

What are other similareties in different species?

- cell division happens more or less identically in almost all organisms
-Genetic similarities are interpetred as evidence for evolution. Human and chimp DNA more than 96% identical

Which tree era's can we mention, old to younger?

1. paleozoic
2. mesozoic
3. cenozoic

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