I think the answer is two
The primary function of red blood cells<span>, or </span>erythrocytes<span>, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs. Hemoglobin (Hgb) is an </span>important<span> protein in the red</span>blood cells<span> that carries oxygen from the lungs to all </span>parts<span> of our body.</span>
The answer to number 12 is mate.
The answer is Permian-Triassic extinction.
The Permian-Triassic extinction was 252 million years ago. It is known as The Great Dying because about 95% of all species died out due to environmental changes (volcanic eruptions, dry climate, melting of ice sheets, etc). This is also the only event in which many insect species wiped out.
