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6th period

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The dragonflies are part of the oldest known insects around today called Odonata. Dragonflies are found in a suborder called Ansoptera.

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This is when genes are passed fro one generation to the next. which leads to mixing up of genes

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Molecular evolution allows use to date matter by seeing how much the molecules have changed over time.

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In most animal kingdoms males fight for females attention, and usually the best male wins. This is an example of sexual selection.

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There were four stages to insect evolution but dragonflies were in the second called Paleoptera the first fossils found were dated to be around 300 million years old

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natural selection is when animals have to fight to stay alive. For example white rabbits have more of a chance of living in Alaska then living in Oregon.

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Divergent evolution is when the same species grow apart in the evolution process.
Parallel evolution is when two different species follow the same path of evolution. so if one animal changes in one way another animal changes in the exact same way.
Convergent evolution is when two different species eventually come together.

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V- variation
I-inheritance
S -selection
T-time
Simply put VIST are the four things that cause evolution.

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The evolution started with the simplest insects closely resembling Silverfish. Some of these insects began growing wings Hemimetabolous were there is no pupa stage. The loss of oxygen in the atmosphere caused the dragonfly species to shrink in size to hte dragonflies we see today.

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Another thing that causes evolution is mutation. A mutation is when the DNA is accidentally replaced causing something to be different then the original plan.

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When one animals genetics allow it to live longer then another of the same species with different genes

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Homologous Structures is when an organ or bone leading to beliefs of common descents. For example humans have tail bones.
Vestigial organs are organs that are there but have no use in that species.
ORP is when a species grows the same way as another.