Which of the following best explains how the structures of chitin and cellulose make them hard to digest

Structures in cells that carry out specific functions.

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

24. how are vaccines used to keep people healthy?