Biology
A man whose blood group is not known meet with a serious accident and needs blood transfusion immediately. Which one of the blood group mentioned below and readily available in the hospital will be safe for transfusion

O, Rh+
AB, Rh+
AB, Rh-
O, Rh-

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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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