Explanation:
Deoxygenated blood enters the right atrium passes through the right ventricle and then goes the lungs through the pulmonary artery.
It becomes oxygenated and enters the left atrium through the pulmonary vein
<span>Both astrology and astronomy study the stars. The major difference in the two is that
1.Astrology is a science that uses the scientific method.
2. Astronomy is based on opinions and beliefs
3.Astronomy is a science that uses the scientific method
4.Astrology is not based on opinions and beliefs
The answer is 3. Astronomy is a science that uses the scientific method.</span>
Proteins have up to four levels of organic structure.
1.Primary structure - the linear arrangement of amino acids.
2. Secondary structure - areas of folding or coiling within a protein.
3. Tertiary structure - the final three dimensional structure of a protein.
4. Quaternary structure - non covalent associations that bind multiple polypeptides into a single larger protein. E.g. hemoglobin has four polymers, two alpha and two beta chains. They are non covalently bound to each other to form a single large protein - hemoglobin.
