Solución ERG.10.2.1.

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Solución:

1. How long has the chlorophyll been absorbing light?
¿Cuánto tiempo ha estado la clorofila absorbiendo luz?

2. The photosystem has been working for several years.
El sistema de fotosíntesis ha estado funcionando durante varios años.

3. Has the leaf ever been exposed to extreme heat?
¿Alguna vez la hoja ha estado expuesta a calor extremo?

4. The plant has been growing since last spring.
La planta ha estado creciendo desde la primavera pasada.

5. 5. How long have the stomata been open?
¿Cuánto tiempo han estado los estomas abiertos?

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Página Mejorada UNIVERSITARIO DE CIENCIAS, MATEMÁTICA E IDIOMAS MÓDULO DE ENTRENAMIENTO AUDIOS Y VIDEOS Unit 1: Foundations of Language Topic 1: The verb to be vs. have for description. Can for ability. Topic 2: Possessive nouns and pronouns. Regular and irregular comparative adjectives. Topic 3: Present continuous for the future. Object pronouns. Unit 2: Navigating Language Topic 1: Will for future intensions. Adverbs of frequency. Topic 2: Could and should for advice and suggestions. Prepositions of movements. Topic 3: Simple past. Regular and irregular verbs. Unit 3: Communication Essentials Topic 1: Would like for preferences and polite requests. Simple past: yes/no and wh- questions. Topic 2: Future ...
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