What are the membranous spheres?

a sphere is called a sphere because , well , its just a other name for a ball such as the earth.

a kind of square with 11 sides

All living things weather in the air or in the oceans, or on and beneath the land surface, make up the biospehere. THE BIOSPEHERE extends INTO each of the other spheres.

Transport Vesicles

d=m/v v= (4/3)(pi)(r^3)set up equation for aluminum and lead 11.3*10^3=m/( (4/3)(pi)(ri^3)) 2.7*10^3=m/( (4/3)(pi)(ra^3))solve for m. then set two equations equal to each other, since they have the...