cell
nucleus
chromosome
DNA
gene
Explanation: I’m not sure if I’m correct, but I hope this helps.
Increasing rates of chronic diseases, increasing elderly population
<em>White blood cells</em> help fight infection
.
Neutrophils, Lymphocytes (which include T-lymphocytes and B-lymphocytes) Monocytes, Macrophages.
It is important to dispose of them to properly avoid harm
