A vocation or calling, especially one that involves some branch of advanced learning or science is referred to by your text as a(n) .

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

answer; participants attitudes about gun control;

they could have terrible tropical storms which will destroy the crops in the colonies

answer; not notated (at least, not in the traditional sense) and includes many improvised sections and solos;