Which best describes the ecological diversity of north america?

north america is very diverse and has about 15 ecological regions.

north america is not very diverse and has about three ecological regions.

north america is somewhat diverse and has about seven ecological regions.

north america is diverse and has about 10 ecological regions.

What initiatives were taken by americans to benefit the war effort? 1. americans planted home gardens to ration food for the troops. 2.american charities were established to provide aid to factory workers. 3.american companies joined together to make products more cheaply. 4.americans created clubs for promoting weapons to be used in the war.