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Update Unit 2: Biology.md

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Grade 10/Science/SNC2DZ/Unit 2: Biology.md
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- Systems of living things - Systems of living things
## Celular Biology ## Celular Biology
A person contains roughly 100 billion cells A person contains roughly 100 tillion 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
- cells are roughly 20 $`\um`$ (micrometer, $`10^{-6}`$ m), around 250 cells / cm
## Cell Theory ## Cell Theory
1. All living things are composed of cells 1. All living things are composed of cells
2. cells are the basic units of living organisms 2. Cells are the basic units of living organisms
3. all cells came from pre-existing cells 3. All cells came from pre-existing cells
## Types Of 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| |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| |Size|Usually smaller|Usually larger|
|Organelles|No membrane, bound organelles|Membrane, bound organelle, the bigger, the more complex| |Organelles|Not membrane-bound, smaller|Membrane-bound, more complex|
|Organization|Usually singler celled|Often multicellular| |Organization|Usually single-celled|Often multicelled|
|Metabolism|May not need oxygen|Usually needs oxygen to exist| |Metabolism|May not need oxygen|Usually needs oxygen to exist|