Explain the meaning of the symbols as they are used in this expression. a + b < --> c + d question 1) a and b are: question 2) c and d are: elements only molecules only elements or molecules reactants products

Question 1) A and B are:  Reactants

Question 2) C and D are:  Products

It is a chemical process in which reactants  A and B react as represented by the (+) symbol, producing Product  C and D

<--> is the sign of reversible reaction that means A + B can form C and D, Similarly C and D can form A and B

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

d. groundwater flows through the subsoil and deposits minerals.