Why do some organisms make one type of protein for a feature while other organisms make two? Please write it in your own words. Please help me!! No links

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.

Which beat describes the brain stem

What do transitional fossils best support?