Which vaccines can be admistered before pregnancy? When it can be?

Whether vaccination can be done during or before pregnancy?

Which gas can be most readily liquefied?

Which vitamin can be synthesized by the human body?

Which changes can be observed during adolescence ?

Which substances can be used to generate biogas?

Which vaccines are given to infants? Why?

Which set can be the universal set for above sets?

On which surfaces can you see your reflection ?

Four prizes are to be distributed among six persons. The number of ways in which this can be done, if there is no restriction on the number of prizes a person can get, is