Density = mass / volume
Plug in the values for mass and volume
Density = 1,800g / 300cm^3
Density = 6 g/cm^3
Well, different organisms require different things. A single celled bacteria does not need a lot at all compared to a plant or animal. One cell can support a bacrerium. An animal needs many cells to carry out the functions necessary for it to live.
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Secondary succession has soil when primary doesn't
I don't know if this helps Sorry if it doesn't I tried
I believe that the answer is B. a fertilized egg splits in two but I could be wrong