---
title: Sea otters, sea urchins and kelp are another trophic cascade. — Wolves in Yellowstone, beavers in Britain and br… · tree and pragmatics
description: Sea otters, sea urchins and kelp are another trophic cascade. Who acts: Sea otters. A sentence of the lesson «Wolves in Yellowstone, beavers in Britain and bringing nature back» of the biology course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# Wolves in Yellowstone, beavers in Britain and bringing nature back, sentence 8

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Sea otters, sea urchins and kelp are another trophic cascade.

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**Who acts:** Sea otters · **What happens:** be · **To what, where:** trophic cascade

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This is a sentence of the lesson «Wolves in Yellowstone, beavers in Britain and bringing nature back» of the biology course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Sea otters), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back.lesson:8
# text = Sea otters, sea urchins and kelp are another trophic cascade.
# source = school lesson (ours)
# course = biology
# lesson = 283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change
1	Sea	sea	NOUN	NN	Number=Sing	2	compound	_	_
2	otters	otter	NOUN	NNS	Number=Plur	11	nsubj	_	_
3	,	,	PUNCT	,	_	5	punct	_	_
4	sea	sea	NOUN	NN	Number=Sing	5	compound	_	_
5	urchins	urchin	NOUN	NNS	Number=Plur	2	conj	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	kelp	kelp	NOUN	NN	Number=Sing	2	conj	_	_
8	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	11	cop	_	_
9	another	another	DET	DT	PronType=Ind	11	det	_	_
10	trophic	trophic	ADJ	JJ	Degree=Pos	11	amod	_	_
11	cascade	cascade	NOUN	NN	Number=Sing	0	root	_	_
12	.	.	PUNCT	.	_	11	punct	_	_
```

## Pragmatics {#pragmatics}

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No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Sea otters and sea urchins and kelp | another trophic cascade |  |  |  |  | tree rules |

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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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:biology:283-wolves-in-yellowstone-beavers-in-britain-and-bringing-nature-back.lesson:8`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): no change. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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