Answer:
Explanation:
Elderly people are particularly at risk of vitamin B12 deficiency because of the high prevalence of atrophic gastritis-associated food-cobalamin (vitamin B12) malabsorption, and the increasing prevalence of pernicious anaemia with advancing age.
Cellulose
I would say 1,2,&4 because bones cant protect organs from bacteria or sunlight.
A. it didn't elicit naturally before conditioning occurred
