C is correct.
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Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate. After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings. Unwilling to challenge the data openly, they erased the report from public view without a word to the authors. When the authors inquired, they received this letter:
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i do not own my copyrights
The concentration is 5 g/L.
Concentration = mass/volume = 10 g/2 L = 5 g/L
Answer: Observation is essential in science. Scientists use observation to collect and record data, which enables them to construct and then test theories
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