[ Vocabulary ]
any required factor that restricts, or holds back the growth of a population
A. community
B. biotic factors
C. abiotic factors
D. limiting factor

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Verbs, Tenses, and VocabularyGrammar and StructurePronouns of QuantityGrammar - FutureThere is or There areDefinite ArticlesInfinitives for reasonsSuperlative & Comparative AdverbsMain Idea and Sentence StructureTransitive or Intransitive VerbsOther quiz:
Preposition of Direction › ViewIt’s fun to ride my bike ________ the hill.
A. up
B. down
C. along
D. through
Grammar › View
Identify the VERB in this sentence:
“Edgar Allan Poe wrote poems and stories.”
A. wrote
B. Edgar Allan Poe
C. stories
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If we had studied hard,we_____________passed in SEE.
A. will
B. would
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Grammar › View
Li Fang is singing the national anthem now.
The adverb of time in this sentence is _________.
A. now
B. singing
C. national
D. is
