Can someone please help me!!

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.

How many types of rock can form from the rock cycle

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?