---
title: «so if half our oxygen is from the sea, we breathe thanks to seaweed… — Plants deeper: leaves and sunlight, ho… · tree and pragmatics
description: «so if half our oxygen is from the sea, we breathe thanks to seaweed and tiny algae?» What is the answer? Test 12 of lesson 251 «Plants deeper: leaves and sunlight, how a tree is made of air» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and 
---

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# Test 12 · Plants deeper: leaves and sunlight, how a tree is made of…

<!-- .ven lang=en -->
«so if half our oxygen is from the sea, we breathe thanks to seaweed and tiny algae?» What is the answer?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 1 · wrong ✗ · **Who acts:** oxygen, we, answer · **What happens:** be, breathe · **To what, where:** sea, thanks

<!-- .vabout -->
This is test 12 of lesson 251 «Plants deeper: leaves and sunlight, how a tree is made of air» of the biology course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/biology/251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air/#t12).

## The question {#question}

<!-- .note -->
*Sentence 1:* «so if half our oxygen is from the sea, we breathe thanks to seaweed and tiny algae?»

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:1
# text = «so if half our oxygen is from the sea, we breathe thanks to seaweed and tiny algae?»
1	«	«	PUNCT	``	_	13	punct	_	SpaceAfter=No
2	so	so	ADV	RB	_	13	advmod	_	_
3	if	if	SCONJ	IN	_	10	mark	_	_
4	half	half	DET	PDT	NumForm=Word|NumType=Frac|PronType=Ind	6	det:predet	_	_
5	our	our	PRON	PRP$	Case=Gen|Number=Plur|Person=1|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	oxygen	oxygen	NOUN	NN	Number=Sing	10	nsubj	_	_
7	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	_	_
8	from	from	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	sea	sea	NOUN	NN	Number=Sing	13	advcl	_	SpaceAfter=No
11	,	,	PUNCT	,	_	10	punct	_	_
12	we	we	PRON	PRP	Case=Nom|Number=Plur|Person=1|PronType=Prs	13	nsubj	_	_
13	breathe	breathe	VERB	VBP	Mood=Ind|Number=Plur|Person=1|Tense=Pres|VerbForm=Fin	0	root	_	_
14	thanks	thanks	NOUN	NN	Number=Sing	13	obj	_	_
15	to	to	ADP	IN	_	16	case	_	_
16	seaweed	seaweed	NOUN	NN	Number=Sing	14	nmod	_	_
17	and	and	CCONJ	CC	_	19	cc	_	_
18	tiny	tiny	ADJ	JJ	Degree=Pos	19	amod	_	_
19	algae	alga	NOUN	NNS	Number=Plur	14	conj	_	SpaceAfter=No
20	?	?	PUNCT	.	_	13	punct	_	SpaceAfter=No
21	»	»	PUNCT	''	_	13	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** *a condition, not said to happen, in a quote* | present | our oxygen |  |  | the sea |  |  | tree rules |
| 2 | **breathe** *in a quote* | present | we | thanks and tiny algae |  |  |  | to seaweed | vn breathe-40.1.2-1 «NP V NP»: agent=Agent thanks=Theme |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

<!-- .note -->
*Sentence 2:* What is the answer?

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:2
# text = What is the answer?
1	What	what	PRON	WP	PronType=Int	0	root	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	1	cop	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	answer	answer	NOUN	NN	Number=Sing	1	nsubj	_	SpaceAfter=No
5	?	?	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | the answer |  |  |  |  |  | tree rules |

## The options {#options}

### Option 1 · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Yes, a large part comes from tiny algae and other sea life

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:o1:1
# text = Yes, a large part comes from tiny algae and other sea life
1	Yes	yes	INTJ	UH	Polarity=Pos	6	discourse	_	SpaceAfter=No
2	,	,	PUNCT	,	_	1	punct	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	large	large	ADJ	JJ	Degree=Pos	5	amod	_	_
5	part	part	NOUN	NN	Number=Sing	6	nsubj	_	_
6	comes	come	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	from	from	ADP	IN	_	9	case	_	_
8	tiny	tiny	ADJ	JJ	Degree=Pos	9	amod	_	_
9	algae	alga	NOUN	NNS	Number=Plur	6	obl	_	_
10	and	and	CCONJ	CC	_	13	cc	_	_
11	other	other	ADJ	JJ	Degree=Pos	13	amod	_	_
12	sea	sea	NOUN	NN	Number=Sing	13	compound	_	_
13	life	life	NOUN	NN	Number=Sing	9	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **come** | present | a large part |  |  | tiny algae and other sea life |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme from alga=Initial\_Location |

### Option 2 {#o2}

<!-- .ven lang=en -->
No, all oxygen comes from rainforests

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:o2:1
# text = No, all oxygen comes from rainforests
1	No	no	INTJ	UH	Polarity=Neg	5	discourse	_	SpaceAfter=No
2	,	,	PUNCT	,	_	1	punct	_	_
3	all	all	DET	DT	PronType=Tot	4	det	_	_
4	oxygen	oxygen	NOUN	NN	Number=Sing	5	nsubj	_	_
5	comes	come	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	from	from	ADP	IN	_	7	case	_	_
7	rainforests	rainforest	NOUN	NNS	Number=Plur	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **come** | present | all oxygen |  |  | rainforests |  |  | vn escape-51.1-1 «NP V PP.initial\_location»: agent=Theme from rainforest=Initial\_Location |

### Option 3 {#o3}

<!-- .ven lang=en -->
Only from fish breathing out bubbles

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:o3:1
# text = Only from fish breathing out bubbles
1	Only	only	ADV	RB	_	3	advmod	_	_
2	from	from	ADP	IN	_	3	case	_	_
3	fish	fish	NOUN	NN	Number=Sing	0	root	_	_
4	breathing	breathe	VERB	VBG	VerbForm=Ger	3	acl	_	_
5	out	out	ADP	RP	_	4	compound:prt	_	_
6	bubbles	bubble	NOUN	NNS	Number=Plur	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **breathe out** | gerund | fish *not said here* | bubbles |  |  |  |  | vn breathe-40.1.2-1 «NP V NP»: agent=Agent bubble=Theme |

### Option 4 · ← Mova's choice {#o4}

<!-- .ven lang=en -->
No, the sea takes oxygen away and never makes it

```conllu
# sent_id = question:biology:251-plants-deeper-leaves-and-sunlight-how-a-tree-is-made-of-air:t12:o4:1
# text = No, the sea takes oxygen away and never makes it
1	No	no	INTJ	UH	Polarity=Neg	5	discourse	_	SpaceAfter=No
2	,	,	PUNCT	,	_	5	punct	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	sea	sea	NOUN	NN	Number=Sing	5	nsubj	_	_
5	takes	take	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
6	oxygen	oxygen	NOUN	NN	Number=Sing	5	obj	_	_
7	away	away	ADV	RB	_	5	advmod	_	_
8	and	and	CCONJ	CC	_	10	cc	_	_
9	never	never	ADV	RB	PronType=Neg	10	advmod	_	_
10	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	conj	_	_
11	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	10	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **take away** | present | the sea | oxygen |  |  |  | away *property* | vn remove-10.1 «NP V NP»: agent=Agent oxygen=Theme |
| 2 | **not** **make** | present | the sea *not said here* | oxygen |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset it=Product |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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