Answer: I) Isotopes
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I Believe The Answer Is B. Physical Weathering.
C. alive. The vaccine contains a live strain of varicella-zoster (chicken pox) virus which has been attenuated so that it will stimulates the immune system but does not cause any disease in healthy people.
Answer: Its a convergent boundary and they move inwards, They create mountains.
The other is a transform boundary and they slide each other like friction, they create earthquakes.
The last one is a divergent boundary and they move outwards, they can create seafloor spreading.