The reaction below is an example of which type of reaction? Bal2 + Pb3N2 = Ba3N2 + Pbl2
A. combustion reaction
B. decomposition reaction
C. synthesis reaction
D. double replacement reaction
E. single replacement reaction

a.   mass number from atomic number

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.