Which blood type could be given as a transfusion for patient with ab blood when the rh factor is unknown

AB-

Explanation:

All AB blood can receive AB-, but only AB+ can receive AB+, so it is safer to use AB- if the RH factor is unknown.

AB+ can receive AB+ or AB-

AB- can only receive AB-

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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