D is the correct answer since all others are highly unlikely.
Answer:
O: Type O individuals can donate blood to anyone, because their blood has no antigens. However, they can only receive blood from other type O individuals (because blood with any antigens is seen as foreign).
Krill, snails and abalones are primary consumers
I think it’s D.)
Explanation: water makes up the hydrosphere. And soil makes up the geosphere.
