Which is made by weathering a) materials b) magma c) Ash d) sediments

According to ohrp, a problem is an “unanticipated problem” when it meets which of the following criteria: unexpected, related or possibly related to the research, suggests that the research does not put the subjects or others at greater riskunexpected, related or possible related to the research, suggests the research puts subjects or others at greater riskunexpected, unrelated to the research but still occurring with a subject, suggests the research puts others at greater riskexpected, related or possible related to the research, suggests the research puts others at greater risk

Is when a person has given their consent based on understanding the actions and facts of a study?

What made it increasingly difficult for president roosevelt to stay neutral during world war ii?