Double layered membrane surrounding the heart is called

The correct answer is the pericardium

The pericardium is a double-walled sac containing the heart and the roots of the great vessels. The pericardial sac has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid.

Brainliest please

b. read the phase at the intersection of any given temperature and pressure.