Abundance of prey can vary locally within a region. —-, whales must be prepared to move constantly in search of the highest food densities.
A. Since
B. Both
C. As
D. Thus

Random Topics:
Present and Past TensesPresent Tenses and VocabularyWill vs Verb InfinitivesPresent Perfect Simple & Present Perfect ContinuousParts of SpeechWill vs be going toSpeech TensesDemonstrative PronounsRelative Clauses beginning with PrepositionsFuture Continuous, Future Perfect and Future Perfect ContinuousOther quiz:
Prepositions › View The ship would soon be sailing into the Atlantic Ocean.
A. Preposition
B. Object of the preposition
C. Prepositional phrase
D. None of the above
Grammar › View
If coastal erosion continues to take place at the present rate, in another fifteen years this beach_________anymore.
A. doesn’t exist
B. isn’t existing
C. isn’t going to exist
D. won’t be exist
Future Tenses › ViewWhat … on Wednesday?
A. are you doing
B. will you do
C. do you do
Grammar › View
Identify the part of speech for the underlined word:
Put the book back on the shelf.
A. Verb
B. Preposition
C. Adverb
D. Conjunction
