High levels of pollution can upset the ____________ of an ...

[ Vocabulary ]

High levels of pollution can upset the ____________ of an ecosystem.

A. average

B. substance

C. reason

D. balance

Select your answer:
A B C D E

Random Topics:

Adjectives & Prepositions Gerund - to Infinitive Gerund & Infinitive Simple Present and Present Continuous Tenses Prepositions and Articles Present Simple Types of Simple Sentences Past Tense, Recount Text, and Future Tense Gerunds + To Infinitive Grammar and Verb Tenses

Other quiz:

Present Simple › View

The bank _________ at 5 o’clock

A. close

B. closes

C. closies

Passive Voice › View

Since 2010 the webpage _______________________ (visit) by 3.5 million people.

A. Since 2010 the webpage is visited by 3.5 million people.
B. Since 2010 the webpage was visited by 3.5 million people.
C. Since 2010 the webpage has been visited by 3.5 million people.

Past and Future Tenses › View

Yesterday, they ________ a delicious cake.

A. Will bake

B. Bakes

C. Baked

Adverbs of Manner › View

Rewrite the sentences using one of the adverbs.

The children laughed at the funny clown ______.

A. secretly

B. happily

C. badly

D. quietly