Answer:
All cells are surrounded by a cell membrane. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others.
Explanation:
They cannot hibernate in winter
Pericardium or pericardial sac.
Hope This Helps!
They make up everything needed to create DNA, although im not very sure, i think the answer your looking for is DNA.
Folic acid is a necessary component of the diet of pregnant women in order to prevent neural tube defects.