What are the four components that can be derived from a unit of blood?

Which is not true about oxygen-17 and oxygen-18?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two