In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
--------
Question: Seasons mean very little in our world of _ hemispheres.

Answer: two


Question: Diffusion occurs between the capillaries of the _ blood supplies.

Answer: two


Question: Pups are unable to swim or find food until _ to eight weeks old or until the ice melts .

Answer:
seven