(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
It leads to the closure of both AV valves and semilunar valves.
It leads to the opening of both AV valves and semilunar valves.
It leads to the opening of AV valves and closure of semilunar valves.
It leads to the closure of AV valves and opening of semilunar valves.