What is the rda for calcium for adults aged 19-50?

Whats the

You answer would be c.

I'd say replacing that habit (of smoking) with a more healthy habit, like going to the gym. c;

Iheard your stomach gets smaller and you don't eat much. is that correct? yes that is correct because once you  don't eat  a lot for a long time then you  can't eat a lot ever and you have it eat a  little more at a time.make me brainiest !