Examine the false statement.

scientists can directly observe the half-life of all radioactive elements.

what option rewords the statement so that it is true?

select all that apply.

a)scientists can calculate the half-life of all radioactive elements using the rate of nuclear decay.
b)scientists can directly observe the rate of nuclear decay for all radioactive elements.
c)scientists cannot directly observe or calculate the rate of nuclear decay for all radioactive elements.
d)scientists can calculate the rate of nuclear decay for all radioactive elements using half-life.