1. What is hemoglobin?

"Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs."

Hemoglobin is the protein in your red blood cells that carries oxygen to your body's organs and tissues and transport carbon dioxide from your organs and tissues back to your lungs. This small little protein in your blood does such a big task.

hope this helps :0

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times