What are glands in that send messages to target cells

This is a type pf behavior that animals are born with and them to survive

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

Where does the citric acid cycle take place in eukaryotic cellular respiration?