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1. One of the reasons why the Stickleback fish may have to have a pelvis is because they might have encounter themselves with different types of fishes and be eating the same food which caused them to form a pelvis over the time. As other fishes started eating the same foods as the other fishes, it might be the cause why they have developed a pelvis.

2. What do Stickleback fishes eat? How long do they live?

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1)I think the pelvis developed by it probably mating with a different species fish.

2)How does the stickleback fish survive with the pelvic and how does it help them

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I think the differences in the stickleback fish change from the different genes the over 20,000 years.

Why do the fish the have scales?

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1. i think that their bodies change over time because of

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1. I think that the differences happened because the fishes with more stickleback had a greater chance of survive in some environments and could pass their genetics through generations and generations.
2. What role does the stickleback have on the fishes and does it benefit them on every environment?

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1. Maybe a Stickleback and a different type of fish mated and their offspring had a pelvis.
2. Does the environment have to do with the population?

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1.  I think that a predator in the lake would stop eating fish if they had the pelvis so they evolved to have one.
2. what is a pelvis useful for?

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1. The differences of fish from thousands of years and now the fist need a pelvis bone today of this year, from 20,000 years ago the fishes did not had a pelvis bone.

2. why do fishes need to have a pointing fins on their backs

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1. I think there's some magical substances in the lake that cause the Stickleback to change over the last 20,000 years.

2. How does the Stickleback pelvis keeps changing over time.?
How does a living a thing change over time?

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1. Maybe stickleback fishes had something harming them and now with the pelvic bone, much damage isn't really done to them because they have evolved.
2. How does the pelvic bone protect fish and in what way does it benefit them?

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1. I think it would have to do with a fish have a rare bone and then their fish developing that bone too and then thier kids also had that bone.

2. A question I have is did the pelvis hurt the fish?

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1. I think it's something to do with the genetics and the genetics can be pass down to the other stickleback fish.

2. how did they get their pelvis?

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In 20,000 years the stickleback fish with pelvis population went down while the one's without pelvis went up,they maybe had it problem with the pelvis.

A question that I have is could they change a different way instead of the pelvis could have different changes?

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1) I think that because some were  getting killed like eating and  some that don't have pelvis were not getting eat because of that sharp thing but the one without it were getting killed and ate. Some were probably leaving and some were probably dying too maybe both of them. Its harder to eat the one with the sharp thing on them then it is to eat the ones with out it.

2) Why does a fish need a sharp thing like that ? How many sticklebacks are still here today? How were they discovered and how did science   know that they had it? Why are they even named that name ?

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1. They probably had a predidor that hunted them easier and faster without the pelvic bone and had nothing to do but evolve a pelvic bone.
2. How did they evolve that pelvic bone and what was the reason to do so.

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1. They probably evolved from the changes in there environment and genetics that do change over time.

2. Why are is there even a pelvic.

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1. I think what made the stickleback change over time was because of the change in habitat.

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1. I think that the explanation about the differences in the stickleback population in the fossil lake over the 20K years is that they might have change the foods that they eat and that it is what caused the Stickleback fish to develop a pelvis. Another reason is that they might have gotten some type of bacxteria that caused them to form a pelvis? Maybe.

2. How many Stickleback fish are now here today? How did they discover this?

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1. I think that the differences in the stickleback were caused by genetics passed down and adaptation.

2. If there were changes before now, does that mean that it is still possible to find new changes in the future? If so what kinds of changes would there possibly be and in what species?

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1. What do you think could explain the differences in the stickleback population in the fossil lake over the 20,000 years shown?

2. What questions do you have about the sticklebacks or about how changes in populations happen over time?