Which of these organelles is most similar to a cafeteria at a school? Chloroplast
Cell Wall
Cytoplasm
Cell Membrane
I need help

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

True or false. mucous membranes secrete mucus that traps pathogens.