Lindsey tripped and cut her knee while she was competing in a track event. When Lindsey went to the doctor, the doctor told her she may have bruised her kneecap. The cut on Lindsey's knee and her bruised kneecap best represent injuries to which levels of organization within her body?

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

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Needs for population