Biology
Deficiency of fluoride leads to Which one of the following health problems?

Mottling of tooth
Stiffening of joints
Tooth caries
Bending of bones

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Biology
Which statement describes decomposers?

Decomposers can produce their own source of energy and can sometimes act as primary producers
All listed here
Decomposers are those organisms that recycle matter in the ecosystem
Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems

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