Question

why blood is a mixture and graphite is an element give any one reason for each

Answer 1

blood- 1) blood is made up of different types of constituents           2) these constituents can be separated.          3) each constituents of the blood shows its own property          4) the composition of blood is not uniform Graphite  -1) it is made up of only one kind of particle i.e. carbon               2) the constituents can't be separated                3) it is made up of only one kind of particle so it only shows                                   property of carbon              4) the composition is uniform throughout 
Hope it helps you