A) hypertonic because it has higher salt levels than inside
The answer is c mediastinum
A. Water being pumped in and out of guard cells.
N positron emission, also called positive beta decay (β+-decay), a proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is a positive particle like an ordinary electron in mass but of opposite charge.
