Vital body systems begin to lose function as you age. aging effects all of the body's cells, tissues and organs which in turn affect the functioning of all body systems. among other changes caused by the cell aging, there is an increase in pigments and

not sure if this what   you'r looking for would be percent composition

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements