What was Rudolf Virchow’s contribution to the cell theory? He concluded that all cells come from preexisting cells.
He concluded that cells are the basic units of structure and function of all living things.
He concluded that all organisms are composed of cells.
He concluded that all cells are similar in composition and metabolic activities.

He concluded that all cells come from preexisting cells.

Explanation:

Rudolf Virchow was a German scientist experienced in many fields, including medicine, biology, anthropology, and prehistory. He is especially noted for his contribution to the cell theory. He discovered that all cells come from preexisting cells, which made it clear that diseases develop at the cellular level. This means that Virchow was the one to discover that cancer cells originate from healthy cells. All of this allowed scientists to diagnose diseases more accurately and efficiently.

there are plastid colour pigment organelle containing a verity of colours

              plastids contain of three organelles 1) chloroplast   (2)   chromoplast   (3)   lecoplast

            the verities of colours are present in chromoplast rather than green so, petals of sun flavour colour is due to chromoplast.

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.