Answer:
stomach
Explanation:
stomach does not make enough intrinsic factor protein, the intestine cannot properly absorb vitamin B12.
medlineplusgov
Answer:
3.5 billion years ago Prokaryotes arose and around 2 billion years later of Eukaryotes arose.
Explanation:
While there is some ambiguity for eukaryotes but the general consensus are on the number given
Nucleus, rough and smooth ER, mitochondria, and vacuoles.
