Answer:
Jan 13, 2014 - Discovery of new Tiktaalik roseae fossils reveals key link in evolution of hind limbs ... Discovered in 2004 by Shubin and co-authors Edward Daeschler, PhD, Associate Curator of ... It had gills, scales and fins, but also had tetrapod-like features such as a mobile neck, robust ribcage and primitive lungs
Explanation:
Answer:
Your answer is probably A). If you find a fossil of an armored fish in layer A, and you find a fossil of a trilobite in layer B (five layers deeper), then you can safely assume that the trilobite is older than the armored fish.
The type of mutation seen is germline mutation
Temperature, depth and salinity.
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