Cells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.
FALSE
All organisms use this "mechanism" to defend their food and shelter. Birds protect their nest just like all other animals and they fight for food.
I hope this answers your question.
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You should ask your teacher to be sure, but I think that you teacher meant like the mode of transmission.... Like genetically inherited and such.
All organisms do have a closed circulatory system
so A <span />
