The planes have infinite points common among them if ___

What is common among the protozoans ?

Perigynous condition is common among

Cladodes are common among

Cladodes are common among

Two pairs of straight lines have the equations y^(2)+xy-12x^(2)=0andax^(2)+2hxy+by^(2)=0 . One line will be common among them if

Two pairs of straight lines have the equations y^(2)+xy-12x^(2)=0andax^(2)+2hxy+by^(2)=0 . One line will be common among them if

Two pairs of straight lines have the equations y^(2)+xy-12x^(2)=0andax^(2)+2hxy+by^(2)=0 . One line will be common among them if

Two pair of straight lines have the eqautions y^2+xy-12x^2=0 and ax^2+2hxy+by^2=0 . One line will be common among them if