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Identify the incorrect statement regarding true bacteria?

(1) As a group, they exhibit maximum metabolic diversity

(2) Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.

(3) Heterotrophic bacteria are the most abundant in nature.

(4) Bacteria reprouduce mainly by fission but sometimes under favourable conditions, they produce spores.