I think that "A" is correct, joining the professional associations is very helpful and effective for the "maintenance" of every skills and every knowledge and education.
<span>How
are professional credentials usually maintained? A. By joining the
professional association </span> <span><span>but the answer B <span>may also be appropriate </span></span>B. By completing a continuing education cycle </span>
Galena usually occurs in cubic crystals. If you hit a specimen of galena with a hammer it will shatter into small perfect cubic crystals. It has a metallic luster and a black to dark gray color and streak. Galena has a hardness of about 2.5 on the Mohs hardness scale which is about as hard as your fingernail.
"Pacemaker" is the one choice among the following choices given in the question that is the treatment that can also regulate heart rhythmsthat has replaced drugs in some cases. The correct option among all the options that are given in the question is the first option or option "A". I hope it helps you.
