*Will Mark The Brainyless* What is a pure substance that contains only one atom called? O a compound

O a precipitate

O an element

O a mixture

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

Ineed to find the answer of this question because i dont understand it

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor