---
title: Coral and its tiny algae are partners. Why does each need the other? — The future of life: de-extinction, cli… · tree and pragmatics
description: Coral and its tiny algae are partners. Why does each need the other? Test 4 · ★★ of lesson 297 «The future of life: de-extinction, climate, coral and frozen zoos» of the biology course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice
---

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# Test 4 · ★★ · The future of life: de-extinction, climate, coral and froz…

<!-- .ven lang=en -->
Coral and its tiny algae are partners. Why does each need the other?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** tiny algae · **What happens:** be, need · **To what, where:** partners, other

<!-- .vabout -->
This is test 4 · ★★ of lesson 297 «The future of life: de-extinction, climate, coral and frozen zoos» 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/297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos/#t4).

## The question {#question}

<!-- .note -->
*Sentence 1:* Coral and its tiny algae are partners.

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:1
# text = Coral and its tiny algae are partners.
1	Coral	coral	NOUN	NN	Number=Sing	0	root	_	_
2	and	and	CCONJ	CC	_	7	cc	_	_
3	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	5	nmod:poss	_	_
4	tiny	tiny	ADJ	JJ	Degree=Pos	5	amod	_	_
5	algae	alga	NOUN	NNS	Number=Plur	7	nsubj	_	_
6	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	cop	_	_
7	partners	partner	NOUN	NNS	Number=Plur	1	conj	_	SpaceAfter=No
8	.	.	PUNCT	.	_	1	punct	_	_
```

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

<!-- .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:* Why does each need the other?

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:2
# text = Why does each need the other?
1	Why	why	ADV	WRB	PronType=Int	4	advmod	_	_
2	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	each	each	DET	DT	PronType=Tot	4	advmod	_	_
4	need	need	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	other	other	ADJ	JJ	Degree=Pos	4	obj	_	SpaceAfter=No
7	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **need** | present · do-support |  | the other |  |  |  |  | vn want-32.1-1-1 «NP V NP ADV»: agent=Pivot other=Theme |

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
The algae get a home, and they make food from sunlight for the coral

<!-- fold The tree, 14 words -->
```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:o1:1
# text = The algae get a home, and they make food from sunlight for the coral
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	algae	alga	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	get	get	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
5	home	home	NOUN	NN	Number=Sing	3	obj	_	SpaceAfter=No
6	,	,	PUNCT	,	_	9	punct	_	_
7	and	and	CCONJ	CC	_	9	cc	_	_
8	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	9	nsubj	_	_
9	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
10	food	food	NOUN	NN	Number=Sing	9	obj	_	_
11	from	from	ADP	IN	_	12	case	_	_
12	sunlight	sunlight	NOUN	NN	Number=Sing	9	obl	_	_
13	for	for	ADP	IN	_	15	case	_	_
14	the	the	DET	DT	Definite=Def|PronType=Art	15	det	_	_
15	coral	coral	NOUN	NN	Number=Sing	9	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **get** | present | the algae | a home |  |  |  |  | vn comprehend-87.2-1 «NP V NP»: agent=Experiencer home=Stimulus |
| 2 | **make** | present | algae *= alga* | food |  | sunlight |  | for the coral | vn build-26.1-1 «NP V NP PP.material PP.beneficiary»: agent=Agent food=Product from sunlight=Material for coral=Beneficiary |

### Option 2 {#o2}

<!-- .ven lang=en -->
They do not need each other at all

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:o2:1
# text = They do not need each other at all
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	4	nsubj	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	not	not	PART	RB	Polarity=Neg	4	advmod	_	_
4	need	need	VERB	VB	VerbForm=Inf	0	root	_	_
5	each	each	DET	DT	ExtPos=PRON|PronType=Rcp	4	obj	_	_
6	other	other	ADJ	JJ	Degree=Pos	5	fixed	_	_
7	at	at	ADP	IN	_	8	case	_	_
8	all	all	DET	DT	PronType=Tot	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **need** | present · do-support | They | each |  | all |  |  | vn want-32.1-1-1 «NP V NP ADV»: agent=Pivot each=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
The algae paint the coral bright colours to scare away hungry fish

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:o3:1
# text = The algae paint the coral bright colours to scare away hungry fish
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	algae	alga	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	paint	paint	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	coral	coral	NOUN	NN	Number=Sing	3	obj	_	_
6	bright	bright	ADJ	JJ	Degree=Pos	7	amod	_	_
7	colours	colour	NOUN	NNS	Number=Plur	3	obj	_	_
8	to	to	PART	TO	_	9	mark	_	_
9	scare	scare	VERB	VB	VerbForm=Inf	3	advcl	_	_
10	away	away	ADV	RB	_	9	advmod	_	_
11	hungry	hungry	ADJ	JJ	Degree=Pos	12	amod	_	_
12	fish	fish	NOUN	NN	Number=Sing	9	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **paint** | present | the algae | the coral |  |  |  |  | vn coloring-24 «NP V NP ADJP»: agent=Agent coral=Patient colour=Result |
| 2 | **scare away** | to-infinitive | the algae *not said here* | hungry fish |  |  |  | away *property* | vn amuse-31.1 «NP V NP»: agent=Stimulus fish=Experiencer |

### Option 4 {#o4}

<!-- .ven lang=en -->
The coral eats the algae and gives nothing back to them

```conllu
# sent_id = question:biology:297-the-future-of-life-de-extinction-climate-coral-and-frozen-zoos:t4:o4:1
# text = The coral eats the algae and gives nothing back to them
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	coral	coral	NOUN	NN	Number=Sing	3	nsubj	_	_
3	eats	eat	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	algae	alga	NOUN	NNS	Number=Plur	3	obj	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	gives	give	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	conj	_	_
8	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	7	obj	_	_
9	back	back	ADV	RB	_	7	advmod	_	_
10	to	to	ADP	IN	_	11	case	_	_
11	them	they	PRON	PRP	Case=Acc|Number=Plur|Person=3|PronType=Prs	7	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **eat** | present | the coral | the algae |  |  |  |  | vn eat-39.1-1 «NP V NP»: agent=Agent alga=Patient |
| 2 | **give back** | present | the coral *not said here* | nothing | algae *= alga* |  |  |  | vn give-13.1 «NP V NP PP.recipient»: agent=Agent nothing=Theme to they=Recipient |

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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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