| Fossils | Rock Layers | Fossil Production | Natural Selection | Evolution |
|---|---|---|---|---|
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What is a Fossil?
The remains of a dead organism that has soaked up water and minerals.
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In your science notebook, which rock layer is the oldest?
Orange rock layer
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True or False?
A saber tooth tiger will fossilize when stuck in a frozen lake for thousands of years.
True
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What is natural selection?
Natural Selection is where nature chooses which organisms live and which die.
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What is evolution?
The change of organisms (species) over time.
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How old does an organism have to be dead in order to be considered a fossil?
at least 10,000 years
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Which rock layers are older than the yellow layer, but newer than the pink layer?
Purple and Blue rock layers
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True or False?
A shark being buried at the bottom of an ocean will fossilize in 100,000 years.
True
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Why are adaptations necessary for natural selection?
Adaptations help certain organisms survive, since they are better fit for their environment.
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What is the process where nature chooses which organisms live and die?
Natural Selection
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What is one way for an organism to become fossilized?
1. Quickly buried in sediment
2. Encased in tar or tree sap 3. Frozen completely in ice |
Why is the yellow layer the newest rock layer?
The yellow layer is closest to the top, which would be present day time (newer dirt layers)
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True or False?
A T Rex dying at the top of a mountain will be buried and fossilize in 5 million years.
False, the top of a mountain experiences a lot of erosion, and it will most likely break down the fossil over 5 million years. There would be no fossil left.
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Squirrels in Canada were first seen in the 1700's. Since then, the squirrels tails have been observed to be bushier and longer. How could this be?
Canada is a colder climate, so squirrels would need warmer tails to keep them alive. Those squirrels with warmer tails survived to reproduce more squirrels with warmer tails.
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What is this an example of?
White moths are being eaten more than dark moths in a forest in Missouri. The dark tree bark helps camouflage the darker moths while the white moths stand out.
Natural Selection
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True or False? Humans will be fossils in the next 100,000 years.
False- Humans are typically buried in boxes or cremated (turned to ashes) which inhibits the fossilization and decomposition process.
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Looking at your science notes, would the reptile era be newer or older than the aquatic animal era?
Newer, because the aquatic (marine) fossils are lower in the rock layers than the retile fossils.
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True or False?
A jellyfish being buried at the bottom of an ocean will fossilize in 100,000 years.
False, jellyfish are soft tissue organisms and will decompose or be eaten long before they are ever buried.
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Komodo dragons are going extinct. Only female Komodo dragons are surviving in their environments. Why might this be?
Female Komodo dragons can reproduce asexually when there is no mate available, but she reproduces only female Komodo dragons when she reproduces asexually. This leads to an increased Komodo dragon population, but less males.
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True or False? Natural Selection is where humans pick which fruits to grow because they are the prettiest and taste the best.
False
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A stegosaurus gets stuck in a watering hole and drowns. Will it turn into a fossil? Explain.
Yes, it should fossilize since there are sediments (small rocks/sand) at the bottom of the lake to be buried under. As years go by, the dead dinosaur will absorb the water and minerals from the lake and will dehydrate (dry up) as the lake dries up in millions of years. This should encase the stegosaurus in a large rock layer.
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What is the purpose of the fossil record?
The fossil record helps scientists date fossils, dirt/rock layers, and other geologic formations to gauge the age of certain periods of time and dead organisms.
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True or False?
An ancient mastodon has fallen ill and died in the river. It will fossilize being buried in the flowing river.
False, the river flows quite fast and the water will erode the dead organism and will not allow fossilization to take place.
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There is a large hawk predator in Raytown that eats mice. The mouse population has changed in Raytown. In Gen. 1, there were more tan mice than brown mice. By Gen. 3, there are almost no tan mice, and many brown mice. Why might this have happened?
The eagle are more tan mice than brown mice, which caused the brown mice to be able to reproduce and populate more brown mice.
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What is the factor that CAUSES evolution?
Reproduction
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