Answer:
option 3 in 1st one and option 4 in 2nd one I think
From the food they intake in different ways such as Plants or other animals such as insects which are their fuel
<span>4 molecules of oxygen. Haemoglobin is a protein found in the red blood cells, which carries oxygen to the cells to perform cellular respiration. Each red blood cell carries around 250 million haemoglobin. So the entire capacity of an RBC is around 1 billion oxygen molecules.</span>
The answer is false,it comes from genes that you get from both your parents
