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A population of one species is separated by a physical barrier, e.g a geographical barrier such as the movement of tectonic plates. There will then be 2 isolated groups of the same species unable to inter...
Plant cells have chloroplasts, a vacuole and a cell wall.
Nucleus, mitochondria, ribosome, cytoplasm, cell membrane.
Covalent bonding is the sharing of electrons between 2 or more non metals.
Oxidation is the loss of electrons.
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