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cactus |
You can prick your skin on a cactus.
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cacti |
The garden centre sold cacti.
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fungus |
A mushroom is a type of fungus.
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Fungi |
Yeast is a fungus that we use to make bread, beer and wine; other fungi can cause diseases such as athletes foot.
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octopus |
An octopus has eight tentacles.
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octopi |
Octopi is plural for octopus.
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nucleus |
The nucleus contains the DNA of the cell.
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nuclei |
The alpha particle is a particle of radiation, composed of two protons and two neutrons, emitted by unstable nuclei.
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bacterium |
Staphylococci: a bacterium of a genus that includes many pathogenic kinds that cause pus formation, especially in the skin and mucous membranes.
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bacteria |
We use bacteria to make yoghurt and cheese, but bacteria can also cause diseases such cholera and food poisoning.
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* This sentence was added by a Spellzone user.
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