Density is the measure of the mass of a material
a.
on earth
b.
at a given temperature
c.
within a given space
i have no clue what the answer might be : ) : (

It has been around since 1858 so b. false

B.) nitrogen fixationnitrogen fixation is the process of nitrogen molecules seeping into the soil and inside plant roots and bacteria. it gives more "life" to plants

The general characteristics of blood are red iron and heat the three types of formed element cells are blood cells, white blood cells and , iron cells