Fill ups
A two layer sac which surrounds and protects the lung is called……………… .

Name the protective sac which surrounds the lungs.

Fill ups A solution which has lower osmotic pressure compared to that of other solution is called…………………… .

Name 2-layered sac surrounding the human heart.

Fill in the blanks. A place where animals are protected in their natural habitat is called ………………

Fill ups Protection of iron by coating with zinc is called……………….. .