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Where Do Humans Get Their Red Hair From? Scientists Have Traced It to a 10-Million-Year-Old Frog Fossil
Skeletal remains conserved the size and shape ... scientists discovered the pigment that caused ginger color in hair from the fossil of a frog. Delicate biological features were hidden deep ...
Nature1mon
Effect of a ‘Fast’ Nerve on ‘Slow’ Muscle Fibres in the Frog
KUFFLER et al. 1–3 have shown that in the frog there are two very distinct types of skeletal muscle fibres; one, the more common, is capable of generating spikes and giving twitches; while the ...