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Update Unit 2: Biology.md

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- Systems of living things
## Celular Biology
A person contains roughly 100 billion cells
- there are roughly to different types of cell s found in mammals
- cells are roughly 20 $`\um`$ (micrometer, $`10^{-6}`$ m), around 250 cells / cm
A person contains roughly 100 tillion cells
- Cells are roughly 20 $`\um`$ (micrometer, $`10^{-6}`$ m), around 250 cells / cm
## Cell Theory
1. All living things are composed of cells
2. cells are the basic units of living organisms
3. all cells came from pre-existing cells
2. Cells are the basic units of living organisms
3. All cells came from pre-existing cells
## Types Of Cells
`Prokaryotic cell`: Meaning before/lacking
`Prokaryotic cell`: Meaning before/lacking nucleus
`Eukaryotic cell`: Has organelles, meaning true, complete.
`Eukaryotic cell`: Means complete nucleus
|Part Of Cell|Prokaryotic|Eukaryotic|
|:-----------|:----------|:---------|
|DNA|In nucleoid region|Usually in membrane, bound nucleus|
|DNA|In nuclear region|Usually in membrane, bound nucleus|
|Size|Usually smaller|Usually larger|
|Organelles|No membrane, bound organelles|Membrane, bound organelle, the bigger, the more complex|
|Organization|Usually singler celled|Often multicellular|
|Metabolism|May not need oxygen|Usually needs oxygen to exist|
|Organelles|Not membrane-bound, smaller|Membrane-bound, more complex|
|Organization|Usually single-celled|Often multicelled|
|Metabolism|May not need oxygen|Usually needs oxygen to exist|