What is it called when white blood cells follow a chemical trail

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

What do scientists need to look at before developing an argument

Explain why ecosystem diversity results in species diversity in a healthy biosphere