Cardiac conduction is a process where electrical impulses activate cardiac tissue and the impulse transmits along a specific pathway to initiate cardiac contraction. Ectopic foci is a term used to describe impulses that originate from a source other than the usual pacemaker. Where can ectopic foci originate?

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

the answer is false?