Sentence #1 has a demonstrative adjective. Sentence #2 has both a demonstrative adjective and a demonstrative pronoun. Sentence #3 uses a regular possessive pronoun. Sentence #4 is the only sentence that uses a present progressive tense.
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Son las cinco y cuarto i’m pretty sure
Answer:
La asociación de estratos y fósiles surge porque las rocas y los fragmentos de sedimentos que forman el suelo están apilados en capas que contienen fósiles.
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