Biology
Which statement describes decomposers?

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

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Biology
Which one among the following statements is correct ?

Except the pulmonary artery, all other arteries carry oxygenated blood
Except the pulmonary vein, all other veins carry oxygenated blood
All veins carry oxygenated blood
All arteries carry oxygenated blood

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