Keyword Analysis & Research: when did humans first appear on earth period

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when did humans first appear on earth period	0.09	0.8	860	72	44
when	0.95	0.1	3545	33	4
did	1.48	0.7	3043	65	3
humans	0.56	0.8	482	19	6
first	1.71	0.6	9561	77	5
appear	0.25	0.1	3139	72	6
on	1.56	1	2529	12	2
earth	0.56	0.7	4883	82	5
period	0.49	0.5	6957	14	6

Keyword	CPC	PCC	Volume	Score
when did humans first appear on earth period	1.57	0.7	5377	60