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3. In an emergency situation, a person with blood type A could receive
ser
O type A blood only
type O blood only.
O type A or type O blood.
type A or type AB blood.
w

O blood only

Explanation:

o blood helps to circulate in our body

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.