What causes two distinct pressure zones between the equator and the polls

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

hope this !

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.