Why do so many different animals have the same structures? (for example, the arm bones in a human are the same bones as a flipper in a whale)

The united states produces an average of 429 billion pounds of food annually. about 133 billion pounds of that food ends up as waste.the percentage of food that the united states wastes each year is %.

Which organelle breaks down sugar molecules that supply energy to the cell ?

Adoença vitiligo afeta qual doença do corpo?