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Antiobiotics kill bacteria but bacteria can become resistant to antibiotics. This happens through a process called natural selection. Within a group/population of bacteria they will all have small diff...

Cell wall

Examples

1. Epithelial cells clear airways and have cilia which beat back and forth to move bacteria.

2. Red blood cells carry oxygen and have no nucleus so they have a larg...

Structural Differences

1. Arteries have a much thicker wall to withstand the high pressure of blood flowing in them, whereas veins<...