We start our geologic time unit this week. As we look back at times when Wisconsin was a shallow sea, when giant carnivorous birds roamed the earth, or when mass extinctions occurred, we ask ourselves, "How do we know that?"
Answer this: What types of fossils are there? What can we learn from them? How do fossils form? What processes expose these long buried fossils?
Contract 7 to be presented on Friday.
Seventh Grade - C4.1-2: From Sponges to Jellyfish.
This week we start with the beginnings of multicellular animals.
Answer this: What do these animals look like? How are their bodies oranized? What invertebrates can we find in our aquarium?
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Contract 7 to be presented on Friday.
45 comments:
Why does coal end up in big clumps like a coal mine instead of being spread all over the place?
Why do minerals fill in for the fossil
Sponges get food through pores, but cnidarians and echinoderms have an opening their center. Mollusks, anthropods, and worms all have a mouth.
If we can find fully intact muscles and body parts from fossils preserved in ice and tar pits, are we attempting cloning?
Austin: Minerals fill in because as the "soft parts" of the object slowly decompose, water carrying minerals seeps and and retains the shape of the object. Then, if not exposed to decomposing bacteria, it will stay preserved in rock.
What is the diference between a niderium(is that how you spell it?)and a archeaopod???Oh My name is JAMES i forgot my google pass
I think the picture that you took from the microscope looks like an octopus or jellyfish.The jellyfish has stingers on it's tentacles,and so does the animal in the picture.
Brady
Allow me to answer your question with another question. How does coal form?
Cooper,
Read Mammoths: Ressurecting Extinct Megafauna
Anton,
Good guess. It is related to the jellyfish. Not a jellyfish, though, nor is it an octopus.
how come ur fish fossil doesnt show the bones of that fish?
How do we really know a fossil is millions of years old, when the rock could just be really worn out and the scientist think it is millions of years old when it just maybe thousands?
austin,
when water makes contact with the bones, the cells are solwly replaced my minerals from the water.
What do nematoda (roundworms)?
How many types of coral are their?
Is the animal you found in the tank the only fresh water cnidrian?
You find coal in big clumps in a coal mine because of how coal forms. Coal starts out as peat. Peat is plant material that forms in a waterlogged enviroment, like a swamp or marsh. Then the rate of plants coming in execeds the rate of decay. Then if the peat gets buried and the are the elements of heat and time you eventully get coal. and since not every piece of land is waterlogged you don't get coal all over the place.
Do any of the animals that lived around the La Brea Tar Pits still live today or is it just their ancestors?
That is really interesting; I never realized that lots of mammoths and saber - tooth tigers died a slow death from being trapped in the tar. Who could've guessed that tar is such a deadly enemy to those mammals and would help us thousands of years later to identify the animal types.
is it true that all animals present on earth can tell us something about our Earth's past?
This is to Austin.
Minerals fill in the cracks of the fossils because water passes through the cracks of the fossil. Everybody knows that minerals is in water because when it dries up what's left is the minerals. A example you see somtimes at home is just look at the sink and you'll see white stuff, where is it from? WATERRR!!!!
And as the minerals go ontop of each other it forms layers. THERE YOU GO!( ^ _ ^ )
once i found a really cool fossil on the hill behind my house and u could only c the top of it but i dug it up with a plastic fork and was hudge!!! my dad got really mad at me becase it is a ski hill and hole would cause some one to get hurt
once i found a really big cool fosil in on a hill behind my house and it made a big hole when i dug it up with a plastic spork. But the hill was a ski hill and aperiently it would caouse someone to get hurt so my dad got mad.
Makayla, Whats the first question?
There are more freshwater cnidrians. There are millions of different species of coral.
Do fossils ever decompose?
After we find an animal frozen and preserved in ice, is still alive?
How does all of the tar get to the ground and collect in a tar pit?
Mckenna,
scientist can check the amounts of certain chemicals and decide how old an object is
Taylor,
whats the difference?
dew man,
surely you know that if an object doesnt move, grow, reproduce, interact, and get energy, it is not living. and since an organism preserved in ice does none of these, it isnt alive
how does tar get there? where does it come from?
dew man- organic sediment from the ocean settles, that land is pushed up, forming dry land. as loose sediment gathers on top of it, pressure and heat build up, squeezing oil out of the material. It is then heated by the magma, and rises through cracks in the earth.
Yes taylor, caribou and moose, whitetail deer all were found in the tar pits.
I think tht it was fun we went outside and got those plants and we discovered what they were.and i liked it when we had tht big discussion about ocean life....It was fun!
where are a worms mouth
and how do worms digest food
how deep are tare pits
How do worms reproduce
Why do people always just believe waht a sciencetist says. Could it just be a very good guess? Because isnt that what science is based on guesses and from one theroy they all need to be linked somehow and this is how it got this way today with us having people believing evolution and coming from monkeys which is real;ly crazy and obsured. But ya I just want to know how they have actual proof not only guess and sometimes good guesses on how old the fossils and the earth really are.
Cnidarians are 95% water so their bodies are basicaly all tissue and if you take them out of water it is just like a puttle of jelly.
traverse, worms reproduce both ways. Some worms reproduce asexually, others sexually, and still others can do both.
Mr. Hoopman told my class that you can tell how old the fossils are because they decompose a half each time but by how much years or days would it take to decompose half each time? How would you know? Do you have to compare with lots of dead animals and watch how long they decompose?
Randy, my first question was what do round worms eat? sorry my mistake
Kate, do you know what kinds of worms reproduce asexually or sexually?
Did you know that sea urchins spawn for reproducing?Did you???
A sea urchin's shell is also called a "test"!
kassi, some examples of worms that reproduce sexually are earthworms, a leech (or a segmented worm), and many more, just to name a few. some examples of worms that reproduce asexually are planaria (or flatworms)which can also reproduce sexually. but most worms reproduce sexually.
sponges are so simple they havent changed in foveror
How does Sunlight turn into energy in solar cells. I know that the protons and electrons move to produce energy. But why do they react at all to sunlight and how does this moving convert to energy?
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