The main function of the skull is to protect the brain?

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of

Several billion years ago which gas was the least prevailant in the atmosphere

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis