Name a blood disease that shows few white blood cells

Why do we perceive objects as retaining their brightness under different lighting levels?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?