Cells

Cell theory:

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Eukaryotic Screen Shot 2020-10-04 at 12.30.43 PM

Living and nonliving things:

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Fossils

1: All living organisms have cells

2: Cells are the basic unit of life

3: All cells come from preexisting cells

All living things have cells. These cells have their own unique job that makes living things function properly. Most of these cells work together.

Nonliving things don't have cells

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Fossils are preserved remains, impressions or traces of organisms that lived in the past

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Types of fossilization: Petrification (contains the two types: replacement and permineralization), Mold and Casts, Carbonization, Fossil Resin, Tar and Ice, Trace fossils.

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Tar & Ice

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Trace Fossils

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1: Petrification has two types: Replacement and Permineralization. Both result in organic material turning into stone or a similar substance. Replacement is when water dissolves the original solid material and replaces it with mineral matter.
Permineralization is when groundwater carries dissolved minerals into the cavities of the bone, wood or shell, the original material is preserved rather than replaced.


2: Mold: When an organism dies and the cavity it has left behind does not fill with minerals
Cast: When an organism dies and the does cavity fills with minerals.


3: Carbonization: When all the parts of the plant or animals decay expect for carbon. The carbon leaves a carbon film of the sedimentary rock.


4: Fossil resin: When resin is excreted from some plants as a defense system to capture bugs. The resin then hardens with the bug inside it. This preserves the bugs DNA.


5: Tar: An animal can fall into a pit of tar and it's whole body will be preserved.
Ice: Another way of trapping and preserving whole bodies is ice. Mammoths have been found with frozen in huge chunks of ice with their skin, hair and even organs still intact.


6: Trace Fossils: Traces of animals. Footprints, tracts, burrows, and Feces are all examples. This evidence is indirect and doesn't show the whole animal.

Eukaryotic cells are any cells or organisms that have a clearly defined nucleus. Eukaryotic cells can be found in plants, animals, fungi...

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Prokaryotic cells are cells that lack a nucleus. Prokaryotic cells are found in single celled organisms such as bacteria.

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An embryo is and early stage of development of multicellular organism. Many animals look the same when in this early of a stage. Embryos of birds fish and even humans start to look the same.

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Fish Amphibian, reptile, Bird, Mammal

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Fish and Salamander