The lungs are surrounded by two protective layers. What do you call them ?

Plants obtained thorugh tissue culture are genetically identical and they are obtained by somatic cells. What do you call them

Plants obtained thorugh tissue culture are genetically identical and they are obtained by somatic cells. What do you call them

What do you mean by layers ?

What are the protective covering of lung called ?

There is a hole in the ozone layer. What do you understand by this?

There is an ozone hole in the Ozone layer. What do you understand by this?

What do you call the eggs of silk moth ?