Keyword Analysis & Research: why is excel not letting me merge cells

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why is excel not letting me merge cells	0.67	0.3	9164	77	39
why	1.77	0.2	4216	42	3
is	1.15	1	3535	71	2
excel	0.45	0.9	3733	82	5
not	1.13	0.4	4800	4	3
letting	0.39	0.6	2585	34	7
me	0.54	0.9	3457	85	2
merge	1.74	0.8	5500	56	5
cells	1.25	0.5	1656	66	5

Keyword	CPC	PCC	Volume	Score
why is excel not letting me merge cells	0.59	0.9	7066	95