The word needed is "because". The correct sentence is: "No one knows what color dinosaurs were because no sample of their skin has survived". This implies that the lack of skin samples prevents knowing the color, and thus the missing information is a reason for our lack of knowledge.
No one knows what color dinosaurs were ______ no sample of their skin has survived.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.