A clear sign that a subduction zone occurs in the ocean is the existence of a . * a)trench
b)rift valley
c)domed mountain
d)folded mountain

This is so important ugh its 25 points

Which of the following is a limitation of a clinical trial? a.)amount of random assignments b.)hospital cost c.)number of test tubes d.)amount of peer review

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next