The water _______ in nature ensures a continuous supply of ...

[ Vocabulary ]

The water _______ in nature ensures a continuous supply of nutrients to aquatic ecosystems.

A. challenge

B. hardship

C. despite

D. cycle

Select your answer:

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Modal Verbs - Obligation Verb Patterns Future Forms Prepositions and Adverbs Grammar - Punctuation Countable Quantifiers Modals for Ability, Possibility and Permission must/should Wishes

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axis

A. real or imaginary line through the center of an object

B. to turn about on an axis or a center

C. the surface of the land and its features

D. an organization in the United States that directs space travel and research