<span>Steroids are lipids and are made up of carbon, hydrogen, and oxygen, while enzymes are proteins and are made up of amino acids. </span>
Answer: The upper chamber is called an atrium, or auricle, and the lower chamber is called a ventricle. The two atria act as receiving chambers for blood entering the heart; the more muscular ventricles pump the blood out of the heart.
Answer is earth and planets orbit around the sun
Helios means sun and centric means centre therefore the sun is in the centre.
Atmosphere we have gases like oxygen
From the biosphere we have food like animals and plants