how long have primates existed

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
how long have primates existed	1.69	0.3	4867	83	30
how	0.51	0.6	9899	21	3
long	1.82	0.9	9052	24	4
have	1.97	0.4	8773	43	4
primates	0.28	1	9198	2	8
existed	2	1	3347	92	7

Keyword	CPC	PCC	Volume	Score
how long have primates existed	0.88	0.9	5833	93
in which era did primates originate	1.93	0.2	5437	36
when did primates appear	0.25	0.5	2166	66
where were the earliest known primates found	1.99	0.7	9786	26
what period did primates first appear	1.08	0.2	9965	14
when the first primates appeared	1.97	0.5	6174	25
when did primates first appear on earth	0.96	1	2707	81
where did primates originate	1.48	0.1	2405	20
the earliest primates evolved during	1.6	1	3954	13
the first true primates were	0.18	0.7	8907	28
when did primates first evolve	0.08	0.5	27	62