You will be sketching a model building made of toothpicks and marshmallows. The building must be at least two floors (stories) high. It should be able to stand on its own and withstand shaking without toppling over. In this approach, what problem are you trying to solve? What are some of the fixed, chosen, and adjustable design features?

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

because growing process had stoped after 4-5 year

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.