Cell, tissue, organ, organ system, organism if that’s what you are referring to
Are you looking for projects like experiments?
Protein, the building blocks of proteins are amino acids, different sequences and combinations of these amino acids result in huge numbers of proteins which have a variety of functions.
Humans are warm blooded and can't be cold blooded because of the environment we live in. We can't sit still during the winter and soak up warmth from the sun.
Hopefully this will help and it's what you are looking for.
