Answer:
B. Biosphere.
Explanation:
Which is the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms. Containing not only hundreds or thousands of ecosystems, but also humans.
Also planets are part of the astrology and space sciences not the biology field.
Hope this helps!
Mass= density*volume
5*3 = 15 grams