Complete the passage by filling in each blank with the word that best preserves the logical support and cause-effect relationships established in the text.
Answer:Because high-resolution spectroscopic observations confirmed that dense interstellar clouds contain complex organic nitriles, astrochemists hypothesized that precursor amino acids were 【synthesized】 during early circumstellar disk formation; indeed, laboratory simulations replicating interstellar radiation fields have successfully 【replicated】 these prebiotic molecules under ambient cryogenic conditions.
Answer
For blank 1, 'synthesized' (or 'generated'/'formed') correctly completes the causal claim supported by observational evidence. For blank 2, 'replicated' (or 'reproduced'/'duplicated') aligns with the support clue 'indeed', confirming that laboratory experiments successfully recreated the astronomical phenomenon.
The initial clause uses the causal marker 'Because' to link astronomical observations of organic nitriles with the hypothesis that prebiotic building blocks were synthesized in space. The second clause uses the intensive support marker 'indeed' to present laboratory evidence that replicated these exact molecular results, confirming the hypothesis.
Step-by-Step Solution
Key Concept
Support and Cause-Effect Structural Signals
Estimated Time:1m 30s