Answer:
i think human is more complex.human is multicellular organisms as yeast is unicellular organisms. more cell and tissue is found in human but less in yeast.human have organs like heart,stomach, brain ,e.t.c. but yeast do not have.
It is typically 30 km to 50 km thick.
i think what is needed is for people to see that alt. energy sources are very useful and inexpensive.
