Researchers believe that about ten thousand years ago, humans also began the domestication of plants and animals, adding agriculture as a means of sustenance to hunting and gathering techniques.
1	Researchers	researcher	NOUN	NNS	Number=Plur	2	nsubj	2:nsubj	Discourse=attribution-positive:28->29:1|Entity=(59-person-new-cf2-1-sgl)
2	believe	believe	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	that	that	SCONJ	IN	_	12	mark	12:mark	Discourse=joint-sequence_m:29->14:3
4	about	about	ADV	RB	_	6	advmod	6:advmod	Entity=(60-time-new-cf5-4-sgl
5	ten	ten	NUM	CD	NumForm=Word|NumType=Card	6	compound	6:compound	XML=<date when:::"-8000">
6	thousand	thousand	NUM	CD	NumForm=Word|NumType=Card	7	nummod	7:nummod	_
7	years	year	NOUN	NNS	Number=Plur	8	obl:tmod	8:obl:tmod	Entity=60)
8	ago	ago	ADV	RB	Degree=Pos	12	advmod	12:advmod	SpaceAfter=No|XML=</date>
9	,	,	PUNCT	,	_	8	punct	8:punct	_
10	humans	human	NOUN	NNS	Number=Plur	12	nsubj	12:nsubj	Entity=(61-person-new-cf3-1-sgl)
11	also	also	ADV	RB	_	12	advmod	12:advmod	_
12	began	begin	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	2	ccomp	2:ccomp	_
13	the	the	DET	DT	Definite=Def|PronType=Art	14	det	14:det	Entity=(62-event-new-cf4-2-coref
14	domestication	domestication	NOUN	NN	Number=Sing	12	obj	12:obj	_
15	of	of	ADP	IN	_	16	case	16:case	_
16	plants	plant	NOUN	NNS	Number=Plur	14	nmod	14:nmod:of	Entity=(63-plant-new-cf6-1-sgl)
17	and	and	CCONJ	CC	_	18	cc	18:cc	_
18	animals	animal	NOUN	NNS	Number=Plur	16	conj	14:nmod:of|16:conj:and	Entity=(64-animal-new-cf7-1-sgl)62)|SpaceAfter=No
19	,	,	PUNCT	,	_	20	punct	20:punct	_
20	adding	add	VERB	VBG	VerbForm=Ger	12	advcl	12:advcl	Discourse=causal-result:30->29:0
21	agriculture	agriculture	NOUN	NN	Number=Sing	20	obj	20:obj	Entity=(65-abstract-new-cf1-1-coref)
22	as	as	ADP	IN	_	24	case	24:case	_
23	a	a	DET	DT	Definite=Ind|PronType=Art	24	det	24:det	Entity=(65-abstract-giv:act-cf1-2-pred
24	means	means	NOUN	NN	Number=Sing	20	obl	20:obl:as	_
25	of	of	ADP	IN	_	26	case	26:case	_
26	sustenance	sustenance	NOUN	NN	Number=Sing	24	nmod	24:nmod:of	Entity=(66-abstract-new-cf8-1-sgl)65)
27	to	to	ADP	IN	_	31	case	31:case	_
28	hunting	hunting	NOUN	NN	Number=Sing	31	compound	31:compound	Entity=(67-abstract-new-cf9-4-sgl(68-event-new-cf11-1-sgl)
29	and	and	CCONJ	CC	_	30	cc	30:cc	_
30	gathering	gathering	NOUN	NN	Number=Sing	28	conj	28:conj:and|31:compound	Entity=(69-event-new-cf10-1-sgl)
31	techniques	technique	NOUN	NNS	Number=Plur	20	obl	20:obl:to	Entity=67)|SpaceAfter=No
32	.	.	PUNCT	.	_	2	punct	2:punct	_
