Final answer:
Adequate science resources usually come from peer-reviewed scientific journals, expert-authored textbooks, reputable databases, and results from applying the scientific method. Scientists assess organic materials in a space rock by isotope analysis and chirality to determine their origin. Reliable sources are essential for valid scientific knowledge.
Step-by-step explanation:
Adequate resource materials in science are typically derived from a variety of reliable sources. These may include peer-reviewed scientific journals, textbooks authored by experts in the field, reputable science databases, and results from scientific investigations following the scientific method. Regarding the question about whether organic materials found in a space rock originated in space or are due to earthly contamination, a scientist could analyze the isotopic composition of the materials, as isotopic ratios that are uncommon on Earth might suggest an extraterrestrial origin. Furthermore, comparing the findings to known terrestrial contamination profiles can help discern their origin. Also, looking at the molecular chirality could provide clues, as life on Earth prefers certain molecular orientations that might not be mirrored in space-sourced organic molecules.