These are two differemt questions I need help ASAP because it's being TIMED. 2. Qanats are .

A) dug by mules

B) no longer used

C) powered by gravity

D) mainly found in the tropics

3. Qanats can be use to .

A) hunt large game

B) dam rivers

C) power modern factories

D) cool homes

Aresearcher conducts a focus group to learn about attitudes towards hygiene and disease prevention. two weeks after the focus group, the researcher learns one of the subjects had a heart attack at home and was hospitalized, but made a full recovery. based on dhs regulations, the researcher report this event to the irb? no, this does not need to be reported since the subject had the heart attack when they were home, not at the focus group.no, this does not need to be reported since it is unrelated to participation in the study.no, this does not need to be reported because two weeks have passed.no, this does not need to be reported since the subject recovered.

Pls will give brainliest and 5star asap pls

Roman builders used rows of arches in there buildings to form a curved ceiling called what