2006: $2.60 ($2.58)
2007: $2.80 ($2.81)
2008: $3.30 ($3.26)
2009: $2.30 ($2,35)
Answer:
The building materials are influenced by local resources.
Explanation:
The farmers built structure based on the material obtainable in their area.Farmers having forest in their region built with wood obtained in that region,whereas those in the grassland used sod to build houses.
Gravity holds these planets in space. Without gravity everything would collapse and the world would end as we know it.