Fossils B/C

[rosez195]

1.What percent of C-14 will remain after 4 Half-Lives?
2.What does Potassium 40 decay to?
3.What is the half-life of Potassium 40?
4.What is the half-life of Uranium 235?
5.What is the half-life of Uranium 238?
6.What is the half-life of Thorium 232?
7.What can scientists learn from the sequence of rock layers?
8.What is the daughter product of Uranium-238?
9.Determining the age of an event or object in years is called...
10.A mass of igneous rock that forms when magma is injected rock and then cools is called an...

[LiliaS]

Alright, here we go:



1) What genus does the fossil above belong to?
2) What does the name of this genus mean?
3) What part of the organism is this fossil?
4) What was the body temperature of this organism and how were researchers able to calculate that value?

1. Brachiosaurus
2. Brachiosaurus means "arm lizard"
3. humerus?
4. 38.2 degrees Celsius, using a chemical thermometer?

[LiliaS]

1.What percent of C-14 will remain after 4 Half-Lives?
2.What does Potassium 40 decay to?
3.What is the half-life of Potassium 40?
4.What is the half-life of Uranium 235?
5.What is the half-life of Uranium 238?
6.What is the half-life of Thorium 232?
7.What can scientists learn from the sequence of rock layers?
8.What is the daughter product of Uranium-238?
9.Determining the age of an event or object in years is called...
10.A mass of igneous rock that forms when magma is injected rock and then cools is called an...

1. 1/16 or 6.25%
2. Calcium 40
3. 1.3 Ga years
4. 700 Ma years
5. 4.5 Ga years
6. 14 Ga years
7. Scientists can learn about Earth's history from the sequence of rock layers. As stated in the Law of Superposition, younger layers form on top of older layers, so as scientists venture down a sequence of layers, anything found can explain our land's history. For example, if a fossil is found on one layer, and another fossil is found 3 layers down, we can predict that the first fossil found is younger, which can tell us about the type of environment that existed during its lifetime, and more. (not sure if this answered the question,...)
8. Lead 206
9. Absolute dating
10. This might be very vague, but an igneous rock.

[Ttonyxx]

Alright, here we go:



1) What genus does the fossil above belong to?
2) What does the name of this genus mean?
3) What part of the organism is this fossil?
4) What was the body temperature of this organism and how were researchers able to calculate that value?

1. Brachiosaurus
2. Brachiosaurus means "arm lizard"
3. humerus?
4. 38.2 degrees Celsius, using a chemical thermometer?

Yup. For 4, they analyzed isotopes in Brachiosaurus teeth.

[rosez195]

1.What percent of C-14 will remain after 4 Half-Lives?
2.What does Potassium 40 decay to?
3.What is the half-life of Potassium 40?
4.What is the half-life of Uranium 235?
5.What is the half-life of Uranium 238?
6.What is the half-life of Thorium 232?
7.What can scientists learn from the sequence of rock layers?
8.What is the daughter product of Uranium-238?
9.Determining the age of an event or object in years is called...
10.A mass of igneous rock that forms when magma is injected rock and then cools is called an...

Answers 1. 6.25%
2. Calcium-40
3. 1.3 Ga years
4. 703.8 Ma years
5. 4.468 Ga years
6. 14 Ga years
7. The geological history of that area.
8. Lead-206
9. Absolute dating
10. An intrusion.

[Fyren]

Thought I'd start this up again.
1. Protozoans were once considered single-celled animals. Why was this and what made protozoans be separated into their own kingdom?
2. What did Genus Bothriolepis eat? What is this type of diet called?
3. A fossil is thought to be 138 thousand years old. Roughly how many half-lives would C-14 have gone through after this amount of time?

[DragonTownEpic]

Answers:

Click to Show Answer

1. They possess animal-like behaviors like motility and predation, as well as lack a cell wall. They were placed in their own kingdom because they are single-cellular. (?)
2. Bothriolepis ate detritus, algae, and microorganisms by eating mud. It is a detritivore
3. About 24.1

[Fyren]

Answers:

Click to Show Answer

1. They possess animal-like behaviors like motility and predation, as well as lack a cell wall. They were placed in their own kingdom because they are single-cellular. (?)
2. Bothriolepis ate detritus, algae, and microorganisms by eating mud. It is a detritivore
3. About 24.1

For 1, the reason why they became a separate kingdom is kind of that but (at least from what I know, correct me if I'm wrong) it was because they were thought to be the ancestors of animals rather than animals themselves. Everything else is correct. Your turn!

[DragonTownEpic]

1. Identify
2. Name the phylum and class of this specimen
3. Describe the function of the pores marked A-C
4. Describe the flow of water through this specimen's respiratory system

[Ttonyxx]

Click to Show Answer

1) Pentremites
2) Phylum Echinodermata and Class Blastoidea
3) A is the anus, B is the entrance to the respiratory organs, C is the mouth for feeding
4) Water would go through the hydrospires which were folded.